diff --git a/crates/engine/src/artboard_cmds.rs b/crates/engine/src/artboard_cmds.rs
index 4bc4a829b2..7d5d7bbb0e 100644
--- a/crates/engine/src/artboard_cmds.rs
+++ b/crates/engine/src/artboard_cmds.rs
@@ -426,6 +426,7 @@ fn add_beside(s: &mut Session, p: &Value) -> Result<Value> {
     };
     let grown = |len: u32, by: i32| (i64::from(len) + i64::from(by)).clamp(1, 300_000) as u32;
     let label = if duplicate { "Duplicate Artboard" } else { "New Artboard" };
+    let add_copy = crate::commands::layer_panel_option(s, "addCopyToCopiedLayersAndGroups", true);
     let (nid, rect) = s.edit(label, |doc, active| {
         if (sx, sy) != (0, 0) {
             crate::image_cmds::translate_doc(doc, cmd, sx, sy)?;
@@ -440,7 +441,7 @@ fn add_beside(s: &mut Session, p: &Value) -> Result<Value> {
         let nid = if duplicate {
             let src_rect = doc.layer(id).and_then(Layer::artboard).map(|a| a.rect).ok_or(EngineError::NoLayer(id))?;
             let (dx, dy) = (rect.x0.saturating_sub(src_rect.x0), rect.y0.saturating_sub(src_rect.y0));
-            let copy = crate::commands::layer_copy(doc, id)?;
+            let copy = crate::commands::layer_copy(doc, id, add_copy)?;
             let nid = doc.insert_above(Some(id), copy);
             // Grow the canvas first, so shapes on the board re-render uncut where they land.
             let fit = |len: u32, edge: i32| i64::from(len).max(i64::from(edge)).clamp(1, 300_000) as u32;
diff --git a/crates/engine/src/artboard_cmds/tests.rs b/crates/engine/src/artboard_cmds/tests.rs
index f3053e21fd..0ad909ab5b 100644
--- a/crates/engine/src/artboard_cmds/tests.rs
+++ b/crates/engine/src/artboard_cmds/tests.rs
@@ -612,3 +612,24 @@ fn add_beside_places_a_board_on_each_side_and_alt_duplicates_contents() {
     assert_eq!(doc(&s).size, before);
     assert!(s.execute("layer.artboard.addBeside", json!({"side": "diagonal"})).is_err());
 }
+
+/// Adding a duplicated artboard beside another appends "copy" to its name only while the Layers panel option is on.
+#[test]
+fn add_beside_duplicate_honors_panel_copy_name_preference() {
+    for add_copy in [false, true] {
+        let mut s = session(8);
+        let id = board_with_square(&mut s);
+        let name = doc(&s).layer(id).unwrap().name.clone();
+        s.edit_prefs(|prefs| {
+            prefs.dialogs.insert("ui.layersPanelOptions".into(), json!({"addCopyToCopiedLayersAndGroups": add_copy}));
+        });
+        let before = doc(&s).clone();
+        let result = s.execute("layer.artboard.addBeside", json!({"layer": id.0, "side": "bottom", "duplicate": true})).unwrap();
+        let copy = LayerId(result["layer"].as_u64().unwrap());
+        let expected = if add_copy { before.copy_name(&name) } else { name };
+        assert_eq!(doc(&s).layer(copy).unwrap().name, expected);
+        assert!(red_at(&s, 15, 155), "the copied artboard retains its contents");
+        s.undo();
+        assert_eq!(doc(&s), &before);
+    }
+}
diff --git a/crates/engine/src/commands.rs b/crates/engine/src/commands.rs
index b7dff3e9fd..d7b9e8740e 100644
--- a/crates/engine/src/commands.rs
+++ b/crates/engine/src/commands.rs
@@ -408,6 +408,12 @@ pub(crate) fn mask_at_depth(mut mask: LayerMask, depth: SampleType) -> Result<La
     Ok(mask)
 }
 
+/// Options from the Layers Panel flyout live in preferences so headless/keyboard commands
+/// behave exactly like pointer-triggered commands. Old preferences preserve Photoshop defaults.
+pub(crate) fn layer_panel_option(s: &Session, key: &str, fallback: bool) -> bool {
+    s.prefs().dialogs.get("ui.layersPanelOptions").and_then(|v| v.get(key)).and_then(Value::as_bool).unwrap_or(fallback)
+}
+
 /// Mask a fill or adjustment layer being created, as Photoshop does: the path selected in the
 /// Paths panel (`"path"`: `"work"`, a saved path's name or a path object) becomes its vector
 /// mask, which makes a Solid Color fill a shape (#1419); without one, the selection becomes its
@@ -751,8 +757,9 @@ fn build() -> Vec<CommandSpec> {
                     return crate::layer_multi_cmds::duplicate_selected(s, in_place, "Duplicate Layers");
                 }
                 let id = layer_param(s, p)?;
+                let add_copy = layer_panel_option(s, "addCopyToCopiedLayersAndGroups", true);
                 let nid = s.edit("Duplicate Layer", |doc, active| {
-                    let mut dup = layer_copy(doc, id)?;
+                    let mut dup = layer_copy(doc, id, add_copy)?;
                     if let Some(name) = &name {
                         dup.name.clone_from(name);
                     }
@@ -1698,12 +1705,14 @@ pub(crate) fn translate_layer(doc: &Document, l: &mut Layer, dx: i32, dy: i32) {
 /// A copy of layer `id` as Layer › Duplicate Layer makes it, not yet in the document: a fresh id,
 /// "… copy" appended to the name, and a copy of the Background layer is an ordinary, unlocked
 /// layer (Photoshop).
-pub(crate) fn layer_copy(doc: &Document, id: LayerId) -> Result<Layer> {
+pub(crate) fn layer_copy(doc: &Document, id: LayerId, add_copy: bool) -> Result<Layer> {
     let src = doc.layer(id).ok_or(EngineError::NoLayer(id))?;
     // A copy of the Background layer is an ordinary, unlocked layer (Photoshop).
     let from_background = doc.is_background(id);
     let mut dup = src.duplicate();
-    dup.name = doc.copy_name(&dup.name);
+    if add_copy {
+        dup.name = doc.copy_name(&dup.name);
+    }
     if from_background {
         dup.locks = Default::default();
     }
diff --git a/crates/engine/src/jobs.rs b/crates/engine/src/jobs.rs
index 0ee0573170..08b8927409 100644
--- a/crates/engine/src/jobs.rs
+++ b/crates/engine/src/jobs.rs
@@ -748,6 +748,26 @@ impl Session {
         }
         // Pixel commands follow the Channels panel target unless the caller names one.
         let run_params = self.admit(id, spec, &params)?;
+        // This UI-only disclosure preference applies to both `execute` and `start`:
+        // desktop UI normally calls `start`, even for synchronous Layer Style commands.
+        // The layer the command will change, named as the command accepts it (id or name), else the
+        // active one. `layer.layerStyle.clear` needs no case: it leaves no effects, so nothing expands.
+        // Transfer Effects changes its destination (`to`), not the layer it takes the effects from.
+        let new_fx_target = if id.starts_with("layer.layerStyle.") {
+            let target = if id == "layer.layerStyle.transferEffects" {
+                crate::commands::layer_param(self, &json!({"layer": params.get("to").cloned().unwrap_or(Value::Null)}))
+            } else {
+                crate::commands::layer_param(self, &params)
+            }
+            .ok();
+            self.active().and_then(|st| {
+                let target = target?;
+                (st.doc.layer(target)?.effects.items.is_empty()).then_some((st.doc.id, target))
+            })
+        } else {
+            None
+        };
+        let expand_new_fx = crate::commands::layer_panel_option(self, "expandNewEffects", true);
         self.coalesce_request = params.get("coalesce").and_then(Value::as_str).map(str::to_string);
         self.color_restrict = crate::channel_cmds::color_restriction(self, id, &run_params);
         self.jobs.spawn = background;
@@ -788,6 +808,17 @@ impl Session {
                 if let Some(before) = before {
                     self.add_relayout_damage(&before);
                 }
+                if let Some((doc_id, layer_id)) = new_fx_target
+                    && let Some(st) = self.active_mut()
+                    && st.doc.id == doc_id
+                    && st.doc.layer(layer_id).is_some_and(|l| !l.effects.items.is_empty())
+                {
+                    if expand_new_fx {
+                        st.fx_collapsed.retain(|id| *id != layer_id);
+                    } else if !st.fx_collapsed.contains(&layer_id) {
+                        st.fx_collapsed.push(layer_id);
+                    }
+                }
                 self.after_command(id, params, spec.journal, Some(nested_from));
                 Ok(Started::Done(v))
             }
diff --git a/crates/engine/src/layer_multi_cmds.rs b/crates/engine/src/layer_multi_cmds.rs
index a9f121c9fb..b5dfc97e64 100644
--- a/crates/engine/src/layer_multi_cmds.rs
+++ b/crates/engine/src/layer_multi_cmds.rs
@@ -1076,6 +1076,84 @@ fn distribute(s: &mut Session, kind: &str) -> Result<Value> {
 /// Reorder one or multiple layers to a single destination in one undoable edit.
 ///
 /// Explicit `layers` are ordered according to the source document, not caller ordering.
+/// A transient snapshot for the Layers panel's "Preview on canvas when reordering layers".
+/// Uses the same source ordering and insertion semantics as `move_to`, but never edits history.
+/// Invalid/self-referential hover targets return None (the committed image stays visible).
+pub fn preview_move(doc: &Document, p: &Value, add_copy: bool) -> Option<Document> {
+    let target = LayerId(p.get("target")?.as_u64()?);
+    let position = p.get("position")?.as_str()?;
+    if !matches!(position, "above" | "below" | "into") {
+        return None;
+    }
+    let copy = p.get("copy").and_then(Value::as_bool).unwrap_or(false);
+    let ids = if let Some(ids) = p.get("layers") {
+        ids.as_array()?.iter().map(|v| v.as_u64().map(LayerId)).collect::<Option<Vec<_>>>()?
+    } else {
+        vec![LayerId(p.get("layer")?.as_u64()?)]
+    };
+    if ids.is_empty() || doc.layer(target).is_none() {
+        return None;
+    }
+    let moved_ids = top_level(doc, &ids);
+    if moved_ids.is_empty() || moved_ids.iter().any(|id| doc.layer(*id).is_none()) {
+        return None;
+    }
+    if moved_ids.len() == 1 && moved_ids[0] == target && !copy {
+        return None;
+    }
+    let target_path = doc.path_of(target)?;
+    for id in &moved_ids {
+        let path = doc.path_of(*id)?;
+        if target_path.starts_with(&path) && !(copy && *id == target && position != "into") {
+            return None;
+        }
+    }
+    if position == "into" && !doc.layer(target)?.is_group() {
+        return None;
+    }
+    // The very structural move the drop commits, so the preview shows the same clip groups,
+    // Background handling and group-depth refusals; a drop `move_to` would refuse has no preview.
+    let mut preview = doc.clone();
+    apply_move(&mut preview, &moved_ids, target, position, copy, add_copy).ok()?;
+    Some(preview)
+}
+
+/// The document-only part of `move_to`, shared with [`preview_move`] so the Layers panel's hover
+/// preview cannot drift from what the drop commits. Moves (or, with `copy`, duplicates) the
+/// top-level `moved_ids` to `pos` (`above`, `below` or `into`) `target`, then applies the
+/// group-depth cap, the Background-stays-at-the-bottom rule and the clip-group rules
+/// (`clip_group::settle`). Returns the ids of the new copies (empty for a move). On `Err` `doc` is
+/// half edited: run it inside `Session::edit` or on a scratch copy.
+fn apply_move(doc: &mut Document, moved_ids: &[LayerId], target: LayerId, pos: &str, copy: bool, add_copy: bool) -> Result<Vec<LayerId>> {
+    const CMD: &str = "layer.moveTo";
+    let background = crate::background_cmds::background_id(doc);
+    let before = if copy { Default::default() } else { crate::clip_group::Before::read(doc, moved_ids) };
+    let mut moved = Vec::with_capacity(moved_ids.len());
+    for &id in moved_ids {
+        moved.push(if copy { crate::commands::layer_copy(doc, id, add_copy)? } else { doc.remove(id).ok_or(EngineError::NoLayer(id))? });
+    }
+    let copies: Vec<LayerId> = if copy { moved.iter().map(|l| l.id).collect() } else { Vec::new() };
+    // Look up the destination AFTER removing every source: its indices may have shifted.
+    let path = doc.path_of(target).ok_or(EngineError::NoLayer(target))?;
+    if pos == "into" {
+        let children = doc.layer_at_mut(&path).and_then(Layer::children_mut).ok_or_else(|| bad(CMD, "target is not a group"))?;
+        children.extend(moved);
+    } else {
+        let (&idx, parent) = path.split_last().ok_or(EngineError::NoLayer(target))?;
+        let siblings = if parent.is_empty() {
+            &mut doc.layers
+        } else {
+            doc.layer_at_mut(parent).and_then(Layer::children_mut).ok_or_else(|| bad(CMD, "target's parent is not a group"))?
+        };
+        let at = if pos == "below" { idx } else { idx + 1 };
+        siblings.splice(at..at, moved);
+    }
+    check_group_depth(doc, "Reorder Layer")?;
+    crate::background_cmds::keep_background_at_bottom(background, doc)?;
+    crate::clip_group::settle(doc, if copy { &copies } else { moved_ids }, &before, false);
+    Ok(copies)
+}
+
 /// Selected descendants of a moved group remain inside their parent; only top-level
 /// selected nodes are detached, and every reference is validated before editing.
 pub fn move_to(s: &mut Session, p: &Value) -> Result<Value> {
@@ -1133,32 +1211,9 @@ pub fn move_to(s: &mut Session, p: &Value) -> Result<Value> {
     }
 
     let original_active = st.active_layer;
-    let background = crate::background_cmds::background_id(doc);
+    let add_copy = crate::commands::layer_panel_option(s, "addCopyToCopiedLayersAndGroups", true);
     let (count, copies) = s.edit(if copy { "Duplicate Layer" } else { "Reorder Layers" }, |doc, active| {
-        let before = if copy { Default::default() } else { crate::clip_group::Before::read(doc, &moved_ids) };
-        let mut moved = Vec::with_capacity(moved_ids.len());
-        for &id in &moved_ids {
-            moved.push(if copy { crate::commands::layer_copy(doc, id)? } else { doc.remove(id).ok_or(EngineError::NoLayer(id))? });
-        }
-        let copies: Vec<LayerId> = if copy { moved.iter().map(|l| l.id).collect() } else { Vec::new() };
-        // Look up the destination AFTER removing every source: its indices may have shifted.
-        let path = doc.path_of(target).ok_or(EngineError::NoLayer(target))?;
-        if pos == "into" {
-            let children = doc.layer_at_mut(&path).and_then(Layer::children_mut).ok_or_else(|| bad(CMD, "target is not a group"))?;
-            children.extend(moved);
-        } else {
-            let (&idx, parent) = path.split_last().ok_or(EngineError::NoLayer(target))?;
-            let siblings = if parent.is_empty() {
-                &mut doc.layers
-            } else {
-                doc.layer_at_mut(parent).and_then(Layer::children_mut).ok_or_else(|| bad(CMD, "target's parent is not a group"))?
-            };
-            let at = if pos == "below" { idx } else { idx + 1 };
-            siblings.splice(at..at, moved);
-        }
-        check_group_depth(doc, "Reorder Layer")?;
-        crate::background_cmds::keep_background_at_bottom(background, doc)?;
-        crate::clip_group::settle(doc, if copy { &copies } else { &moved_ids }, &before, false);
+        let copies = apply_move(doc, &moved_ids, target, pos, copy, add_copy)?;
         *active = if copy {
             copies.last().copied()
         } else if batch.is_some() {
@@ -1406,13 +1461,14 @@ pub fn delete_selected(s: &mut Session) -> Result<Value> {
 pub fn duplicate_selected(s: &mut Session, in_place: bool, label: &str) -> Result<Value> {
     let sel = selected(s);
     let old_active = s.active().and_then(|d| d.active_layer);
+    let add_copy = crate::commands::layer_panel_option(s, "addCopyToCopiedLayersAndGroups", true);
     let (copies, active) = s.edit(label, |doc, active| {
         let mut copies = Vec::new();
         let mut new_active = None;
         for id in top_level(doc, &sel) {
             // Match the single-layer duplicate path: Background copies become
             // ordinary layers, while normal copies retain their original locks.
-            let dup = crate::commands::layer_copy(doc, id)?;
+            let dup = crate::commands::layer_copy(doc, id, add_copy)?;
             let nid = doc.insert_above(Some(id), dup);
             if !in_place {
                 crate::artboard_cmds::place_copy(doc, nid)?;
@@ -2850,6 +2906,7 @@ mod tests {
         assert!(s.execute("layer.setProps", json!({"locks": {"nope": true}})).is_err());
     }
 
+    /// `document.inspect` lists the selected layers and marks them in the layer list.
     #[test]
     fn inspect_reports_selection() {
         let mut s = session(8);
@@ -2861,3 +2918,256 @@ mod tests {
         assert_eq!(v["layers"][0]["selected"], true);
     }
 }
+
+#[cfg(test)]
+mod layers_panel_parity_tests {
+    use super::*;
+
+    /// A 24×16 document with three layers, "Test 0" to "Test 2", above the Background; the last one is active.
+    fn new_session() -> (Session, Vec<LayerId>) {
+        let mut s = Session::new();
+        s.execute("file.new", json!({"width": 24, "height": 16})).unwrap();
+        let ids = (0..3).map(|n| LayerId(s.execute("layer.new.layer", json!({"name": format!("Test {n}")})).unwrap()["layer"].as_u64().unwrap())).collect();
+        (s, ids)
+    }
+
+    /// Set one Layers panel option in the preferences, as the Panel Options dialog does.
+    fn option(s: &mut Session, key: &str, enabled: bool) {
+        s.prefs.edit(|p| {
+            let val = p.dialogs.entry("ui.layersPanelOptions".into()).or_insert_with(|| json!({}));
+            if let Some(o) = val.as_object_mut() {
+                o.insert(key.to_owned(), json!(enabled));
+            }
+        });
+    }
+
+    /// The drag preview equals the committed `layer.moveTo` result and never touches the document or its history.
+    #[test]
+    fn preview_matches_real_move_and_never_edits_document_or_history() {
+        let (mut s, ids) = new_session();
+        let params = json!({"layer": ids[0].0, "target": ids[2].0, "position": "above"});
+        let before = s.active().unwrap().doc.clone();
+        let undo_before = s.active().unwrap().history.entries().len();
+        let candidate = preview_move(&before, &params, true).unwrap();
+        assert_eq!(*before, *s.active().unwrap().doc);
+        assert_eq!(s.active().unwrap().history.entries().len(), undo_before);
+        s.execute("layer.moveTo", params).unwrap();
+        assert_eq!(candidate, *s.active().unwrap().doc, "visual preview must match committed layer order");
+    }
+
+    /// A previewed ⌥-drag copy names its layers like the committed copy, with and without the "copy" suffix option.
+    #[test]
+    fn preview_copy_and_no_copy_suffix_option_match_committed_layers() {
+        let (mut s, ids) = new_session();
+        option(&mut s, "addCopyToCopiedLayersAndGroups", false);
+        let params = json!({"layer": ids[0].0, "target": ids[2].0, "position": "below", "copy": true});
+        let before = s.active().unwrap().doc.clone();
+        let candidate = preview_move(&before, &params, false).unwrap();
+        s.execute("layer.moveTo", params).unwrap();
+        let actual = &s.active().unwrap().doc;
+        assert_eq!(candidate.layers.iter().map(|l| l.name.as_str()).collect::<Vec<_>>(), actual.layers.iter().map(|l| l.name.as_str()).collect::<Vec<_>>());
+        assert_eq!(actual.layer_count(), before.layer_count() + 1);
+        assert_eq!(actual.layers.iter().filter(|l| l.name == "Test 0").count(), 2);
+        let d = s.execute("layer.duplicate", json!({"layer": ids[1].0})).unwrap();
+        let duplicate = LayerId(d["layer"].as_u64().unwrap());
+        assert_eq!(s.active().unwrap().doc.layer(duplicate).unwrap().name, "Test 1");
+        option(&mut s, "addCopyToCopiedLayersAndGroups", true);
+        let d = s.execute("layer.duplicate", json!({"layer": ids[1].0})).unwrap();
+        assert!(s.active().unwrap().doc.layer(LayerId(d["layer"].as_u64().unwrap())).unwrap().name.contains("copy"));
+    }
+
+    /// Drops the command refuses (or ignores) give no preview and leave the document alone; a multi-layer preview follows the committed stack order.
+    #[test]
+    fn preview_rejects_invalid_drop_unchanged() {
+        let (mut s, ids) = new_session();
+        let before = s.active().unwrap().doc.clone();
+        // Dropping a layer on itself is a no-op for the command, the others are errors.
+        for (p, command_rejects) in [
+            (json!({"layer": ids[1].0, "target": ids[1].0, "position": "above"}), false),
+            (json!({"layer": ids[1].0, "target": 999999, "position": "below"}), true),
+            (json!({"layer": ids[1].0, "target": ids[2].0, "position": "into"}), true),
+            (json!({"layer": ids[1].0, "target": ids[2].0, "position": "invalid"}), true),
+        ] {
+            assert!(preview_move(&before, &p, true).is_none(), "{p}");
+            let result = s.execute("layer.moveTo", p.clone());
+            if command_rejects {
+                assert!(result.is_err(), "{p}");
+            } else {
+                assert_eq!(result.unwrap(), Value::Null, "{p}");
+            }
+            assert_eq!(*before, *s.active().unwrap().doc, "{p}");
+        }
+        // Multi-layer preview and commit follow the same stack order regardless of params order.
+        let p = json!({"layers": [ids[2].0, ids[0].0], "target": ids[1].0, "position": "below"});
+        let candidate = preview_move(&before, &p, true).unwrap();
+        s.execute("layer.moveTo", p).unwrap();
+        assert_eq!(candidate, *s.active().unwrap().doc);
+    }
+
+    /// A 16×16 document holding `spec` (bottom to top, `*` = clipped) above its Background. Every
+    /// layer is a translucent, differently placed rectangle, so the stack order and the clip
+    /// groups both show in the composite.
+    fn clip_stack(spec: &str) -> Session {
+        let mut s = Session::new();
+        s.execute("file.new", json!({"width": 16, "height": 16})).unwrap();
+        for (n, name) in spec.split_whitespace().enumerate() {
+            let id = LayerId(s.execute("layer.new.layer", json!({"name": name.trim_end_matches('*')})).unwrap()["layer"].as_u64().unwrap());
+            let n = n as i32;
+            let colour = [(n % 3) as f32 * 0.5, ((n + 1) % 3) as f32 * 0.5, ((n + 2) % 3) as f32 * 0.5, 0.6];
+            s.edit("paint", |doc, _| {
+                let layer = doc.layer_mut(id).unwrap();
+                layer.clipped = name.ends_with('*');
+                layer.surface_mut().unwrap().fill_rect(Rect::new(n * 2, 0, n * 2 + 10, 16), &colour);
+                Ok(())
+            })
+            .unwrap();
+        }
+        s
+    }
+
+    /// Every layer of `doc` from the bottom, `*` marking the clipped ones.
+    fn stack_text(doc: &Document) -> String {
+        doc.layers.iter().map(|l| format!("{}{}", l.name, if l.clipped { "*" } else { "" })).collect::<Vec<_>>().join(" ")
+    }
+
+    /// The id of the layer called `name`, searching the whole layer tree.
+    fn id_of(s: &Session, name: &str) -> u64 {
+        s.active().unwrap().doc.walk().into_iter().find(|(_, _, l)| l.name == name).unwrap().2.id.0
+    }
+
+    /// The preview of `params` and the committed `layer.moveTo` show the same stack (names, clip
+    /// flags) and the same composite, and both are `want`.
+    fn assert_preview_is_commit(mut s: Session, params: Value, want: &str) {
+        let before = s.active().unwrap().doc.clone();
+        let preview = preview_move(&before, &params, true).expect("the drop has a preview");
+        s.execute("layer.moveTo", params.clone()).unwrap();
+        let committed = &s.active().unwrap().doc;
+        assert_eq!(stack_text(&preview), want, "preview of {params}");
+        assert_eq!(stack_text(committed), want, "commit of {params}");
+        assert_eq!(photocraft_compose::flatten(&preview).px, photocraft_compose::flatten(committed).px, "composite of {params}");
+    }
+
+    /// Previewed moves join and release clipping groups exactly as the committed reorder does, copies included.
+    #[test]
+    fn preview_follows_clip_groups_like_the_committed_reorder() {
+        // The fixtures of `clip_group::reorder_joins_and_leaves_groups`.
+        for (spec, layers, target, pos, want) in [
+            // A layer dropped into a clip group joins it.
+            ("B C1* C2* U", vec!["U"], "C1", "above", "Background B C1* U* C2*"),
+            ("B C1* C2* U V", vec!["U", "V"], "C1", "above", "Background B C1* U* V* C2*"),
+            // A clipped layer dropped off its group is released.
+            ("B C1* C2* U", vec!["C1"], "U", "above", "Background B C2* U C1"),
+            // A base moved away releases the layers clipped to it.
+            ("B C1* C2* U", vec!["B"], "U", "above", "Background C1 C2 U B"),
+            // A base moved up into its own group joins it, and the layers it left are released.
+            ("B C1* C2*", vec!["B"], "C1", "above", "Background C1 B* C2"),
+            ("X B C1* C2* U", vec!["B", "C1"], "U", "above", "Background X C2 U B C1*"),
+        ] {
+            let s = clip_stack(spec);
+            let ids: Vec<u64> = layers.iter().map(|n| id_of(&s, n)).collect();
+            let t = id_of(&s, target);
+            assert_preview_is_commit(s, json!({"layers": ids, "target": t, "position": pos}), want);
+        }
+        // An option-drag copy joins the clip group it lands in too.
+        let s = clip_stack("B C1* C2* U");
+        let (u, c1) = (id_of(&s, "U"), id_of(&s, "C1"));
+        assert_preview_is_commit(s, json!({"layer": u, "target": c1, "position": "above", "copy": true}), "Background B C1* U copy* C2* U");
+    }
+
+    /// Copying the locked Background in a preview gives the same unlocked copy, joining the clip group it lands in, as the command.
+    #[test]
+    fn preview_copies_the_background_like_the_committed_copy() {
+        let mut s = clip_stack("A B*");
+        let (bg, a) = (s.active().unwrap().doc.background().unwrap().id, id_of(&s, "A"));
+        let before = s.active().unwrap().doc.clone();
+        assert_ne!(before.layer(bg).unwrap().locks, Default::default(), "the Background is locked");
+        let p = json!({"layer": bg.0, "target": a, "position": "above", "copy": true});
+        let preview = preview_move(&before, &p, true).unwrap();
+        s.execute("layer.moveTo", p).unwrap();
+        let committed = &s.active().unwrap().doc;
+        // The copy is an ordinary, unlocked layer that joins the clip group it lands in.
+        assert_eq!(stack_text(committed), "Background A Background copy* B*");
+        assert_eq!(stack_text(&preview), stack_text(committed));
+        for doc in [&preview, committed] {
+            assert_eq!(doc.layers.get(2).unwrap().locks, Default::default());
+            assert!(doc.layers.first().unwrap().locks != Default::default());
+        }
+        assert_eq!(photocraft_compose::flatten(&preview).px, photocraft_compose::flatten(committed).px);
+    }
+
+    /// A drop that would move the Background off the bottom has no preview, as the command refuses it.
+    #[test]
+    fn preview_refuses_what_would_leave_the_background_off_the_bottom() {
+        let mut s = clip_stack("A B");
+        let (bg, a) = (s.active().unwrap().doc.background().unwrap().id, id_of(&s, "A"));
+        let before = s.active().unwrap().doc.clone();
+        for p in [
+            json!({"layer": a, "target": bg.0, "position": "below"}),
+            json!({"layer": bg.0, "target": bg.0, "position": "below", "copy": true}),
+            json!({"layer": a, "target": bg.0, "position": "below", "copy": true}),
+        ] {
+            assert!(preview_move(&before, &p, true).is_none(), "{p}");
+            assert!(s.execute("layer.moveTo", p.clone()).is_err(), "{p}");
+            assert_eq!(*before, *s.active().unwrap().doc, "{p}");
+        }
+    }
+
+    /// The UI runs commands through `start`; Expand New Effects applies there as well as to `execute`.
+    #[test]
+    fn expand_new_effects_applies_to_ui_start_dispatch_too() {
+        let (mut s, ids) = new_session();
+        option(&mut s, "expandNewEffects", false);
+        let target = ids[0];
+        let started = s.start("layer.layerStyle.dropShadow", json!({"layer": target.0})).unwrap();
+        assert!(matches!(started, crate::jobs::Started::Done(_)));
+        assert!(s.active().unwrap().fx_collapsed.contains(&target));
+    }
+
+    /// Whether new effects start expanded is view state: it adds no history step, and editing an existing effect keeps its disclosure.
+    #[test]
+    fn expand_new_effects_is_view_state_and_keeps_edit_history_clean() {
+        let (mut s, ids) = new_session();
+        option(&mut s, "expandNewEffects", false);
+        let target = ids[0];
+        let history = s.active().unwrap().history.entries().len();
+        s.execute("layer.layerStyle.dropShadow", json!({"layer": target.0, "size": 2})).unwrap();
+        assert_eq!(s.active().unwrap().history.entries().len(), history + 1);
+        assert!(s.active().unwrap().fx_collapsed.contains(&target));
+        option(&mut s, "expandNewEffects", true);
+        let other = ids[1];
+        s.execute("layer.layerStyle.stroke", json!({"layer": other.0, "size": 2})).unwrap();
+        assert!(!s.active().unwrap().fx_collapsed.contains(&other));
+        // Editing the existing effect must not unexpectedly change its disclosure.
+        s.execute("layer.layerStyle.dropShadow", json!({"layer": target.0, "size": 5})).unwrap();
+        assert!(s.active().unwrap().fx_collapsed.contains(&target));
+    }
+
+    /// The disclosure follows the layer the command changes, however the command names it: a
+    /// layer given by name is not the active one.
+    #[test]
+    fn expand_new_effects_follows_a_layer_named_by_its_name() {
+        let (mut s, ids) = new_session();
+        option(&mut s, "expandNewEffects", false);
+        let (named, active) = (ids[0], ids[2]);
+        assert_eq!(s.active().unwrap().active_layer, Some(active));
+        s.execute("layer.layerStyle.dropShadow", json!({"layer": "Test 0", "size": 2})).unwrap();
+        assert!(s.active().unwrap().doc.layer(named).is_some_and(|l| !l.effects.items.is_empty()));
+        assert!(s.active().unwrap().fx_collapsed.contains(&named), "the named layer's new effects start collapsed");
+        assert!(!s.active().unwrap().fx_collapsed.contains(&active), "the active layer is not the one changed");
+    }
+
+    /// Transfer Effects changes the layer it moves the effects to, so that is the layer whose
+    /// disclosure follows the option, not the active layer or the one the effects came from.
+    #[test]
+    fn expand_new_effects_follows_the_transfer_destination() {
+        let (mut s, ids) = new_session();
+        let (from, to, active) = (ids[0], ids[1], ids[2]);
+        s.execute("layer.layerStyle.dropShadow", json!({"layer": from.0, "size": 2})).unwrap();
+        option(&mut s, "expandNewEffects", false);
+        assert_eq!(s.active().unwrap().active_layer, Some(active));
+        s.execute("layer.layerStyle.transferEffects", json!({"from": from.0, "to": to.0, "copy": true})).unwrap();
+        assert!(s.active().unwrap().doc.layer(to).is_some_and(|l| !l.effects.items.is_empty()));
+        assert!(s.active().unwrap().fx_collapsed.contains(&to), "the destination's new effects start collapsed");
+        assert!(!s.active().unwrap().fx_collapsed.contains(&active), "the active layer is not the one changed");
+    }
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 06e775c28e..1f9feefc30 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -1205,10 +1205,15 @@ pub(crate) fn display_doc(app: &mut PhotocraftApp, idx: usize) -> (std::sync::Ar
     if let Some(shown) = crate::patch_preview::display_doc(app, idx) {
         return shown;
     }
-    // Content-Aware Move drag or box: the result, once computed in the background.
+    // Content-Aware Move drag or box: the result, once computed in the background. It comes
+    // before the reorder preview, which is built from the session document and would drop it.
     if let Some(shown) = crate::cam_preview::display_doc(app, idx) {
         return shown;
     }
+    // Live Layers-panel reorder previews the actual composite before mouse release.
+    if let Some(shown) = crate::layers_panel_ui::display_reorder(app, idx) {
+        return shown;
+    }
     // A blend mode hovered in the Layers panel.
     if let Some(shown) = crate::blend_preview::display_doc(app, idx) {
         return shown;
diff --git a/crates/ui-egui/src/clip_line_ui/tests.rs b/crates/ui-egui/src/clip_line_ui/tests.rs
index ba89495402..d7c443aab9 100644
--- a/crates/ui-egui/src/clip_line_ui/tests.rs
+++ b/crates/ui-egui/src/clip_line_ui/tests.rs
@@ -83,14 +83,17 @@ fn the_clip_cursor_shows_only_with_alt_over_a_line() {
     assert_ne!(h.output().platform_output.cursor_icon, egui::CursorIcon::None, "mid-row: no line");
 }
 
+/// A 32-point-high row for `layer` starting `top` points down, with no thumbnail, name or indicators.
 fn row(layer: LayerId, top: f32) -> RowRects {
-    RowRects { layer: layer.0, row: Rect::from_min_size(pos2(0.0, top), vec2(240.0, 32.0)), name: None, indicators: Vec::new() }
+    RowRects { layer: layer.0, row: Rect::from_min_size(pos2(0.0, top), vec2(240.0, 32.0)), thumbnail: None, name: None, indicators: Vec::new() }
 }
 
+/// The id of the layer called `name`, wherever it sits in the tree.
 fn named(doc: &Document, name: &str) -> LayerId {
     doc.walk().into_iter().find(|(_, _, l)| l.name == name).unwrap().2.id
 }
 
+/// A clipping line appears only between siblings that are neighbours in the stack, not at a group's edge, in the eye column or inside a row.
 #[test]
 fn only_siblings_next_to_each_other_meet_at_a_line() {
     // Background, `d`, and the group `g { c }` above it.
diff --git a/crates/ui-egui/src/dock.rs b/crates/ui-egui/src/dock.rs
index 5f0a95e915..1323852948 100644
--- a/crates/ui-egui/src/dock.rs
+++ b/crates/ui-egui/src/dock.rs
@@ -638,6 +638,12 @@ pub fn show(app: &mut PhotocraftApp, ui: &mut egui::Ui, shown: &[Group], mut bod
                 ui.close();
             }
             ui.separator();
+            if ui.button(tl!("Close")).clicked() {
+                if let Some(&tab) = indices.get(sel) {
+                    actions.push(Action::CloseTab(g, tab));
+                }
+                ui.close();
+            }
             if ui.button(tl!("Close Tab Group")).clicked() {
                 actions.push(Action::Close(g));
                 ui.close();
diff --git a/crates/ui-egui/src/dock_tests.rs b/crates/ui-egui/src/dock_tests.rs
index f0a64562c4..f8b325ed92 100644
--- a/crates/ui-egui/src/dock_tests.rs
+++ b/crates/ui-egui/src/dock_tests.rs
@@ -1148,3 +1148,24 @@ fn brush_settings_window_is_closed_on_restart_but_can_be_reopened() {
     apply(&mut workspace, &saved);
     assert!(workspace.ui.panels.brush_settings, "switching workspaces still restores their saved layout");
 }
+
+/// Layers panel options live in the preferences on their own (like Photoshop's Panel Options),
+/// so a workspace layout neither saves nor restores them.
+#[test]
+fn workspace_layouts_leave_the_layers_panel_options_alone() {
+    let mut app = PhotocraftApp::new(photocraft_engine::Session::new(), crate::Services::default());
+    app.ui.layers_panel_options.show_filters = false;
+    crate::layers_panel_ui::persist_options(&mut app);
+    let stored = app.session.prefs().dialogs.get("ui.layersPanelOptions").cloned();
+    assert!(stored.is_some(), "the options are saved in the preferences");
+
+    let mut saved = snapshot(&app);
+    assert!(saved.get("layersPanelOptions").is_none(), "a layout does not carry the options");
+
+    // A layout saved by an earlier build still has the key; it must not win over the preferences.
+    saved["layersPanelOptions"] = json!({"showFilters": true, "thumbnailSize": "large"});
+    apply(&mut app, &saved);
+    assert!(!app.ui.layers_panel_options.show_filters);
+    assert_ne!(app.ui.layers_panel_options.thumbnail_size, crate::state::LayerThumbnailSize::Large);
+    assert_eq!(app.session.prefs().dialogs.get("ui.layersPanelOptions").cloned(), stored);
+}
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index 9f3ca51dd8..22b371ccd5 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -2667,6 +2667,26 @@ cameraData	Lens	Objektiv
 	Duplicate Layer	Duplikovat vrstvu
 	Contract	Zúžit
 
+	Animation Options	Možnosti animace
+	Entire Document	Celý dokument
+	Filter Options	Možnosti filtrování
+	Layer Bounds	Hranice vrstvy
+	Layers Panel Options	Možnosti panelu Vrstvy
+	Lock Layers	Zamknout vrstvy
+	New Artboard…	Nové kreslicí plátno…
+	New Group	Nová skupina
+	New Group…	Nová skupina…
+	New Layer…	Nová vrstva…
+	Panel Options…	Možnosti panelu…
+	Prevent Auto-Nesting	Zabránit automatickému vnoření
+	Show Layers	Zobrazit vrstvy
+	Thumbnail Contents	Obsah miniatur
+	Thumbnail Size	Velikost miniatur
+	Expand New Effects	Rozbalovat nové efekty
+	Add “copy” to Copied Layers and Groups	Přidávat „kopie“ ke kopírovaným vrstvám a skupinám
+	Preview on canvas when reordering layers	Zobrazovat náhled na plátně při změně pořadí vrstev
+	Show layer mask badges	Zobrazovat odznaky masek vrstev
+
 # Dynamic labels the tl! literal scanner cannot see: filter and Filter Gallery parameter names and
 # choices (humanized from their keys), Camera Raw controls, render filters (Flame, Picture Frame, Tree),
 # measurement columns, file info fields and the macOS application menu. Translated the same way as
@@ -3088,7 +3108,6 @@ cameraData	Lens	Objektiv
 	Liquify	Zkapalnit
 	List	Seznam
 	Load Selection	Načíst výběr
-	Lock Layers	Zamknout vrstvy
 	Locked	Zamčeno
 	Long Lines	Dlouhé čáry
 	Long Strokes	Dlouhé tahy
@@ -3136,11 +3155,9 @@ cameraData	Lens	Objektiv
 	Neon Glow	Neonová záře
 	Neutralize	Neutralizovat
 	New Channel	Nový kanál
-	New Group	Nová skupina
 	New Guide	Nové vodítko
 	New Guide Layout	Nové rozvržení vodítek
 	New Layer Comp	Nová kompozice vrstev
-	New Layer…	Nová vrstva…
 	New Video Layer from File	Nová video vrstva ze souboru
 	New document	Nový dokument
 	New document…     ⌘N	Nový dokument…     ⌘N
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index c4c03454ea..09df8369fe 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -2698,6 +2698,25 @@ cameraData	Lens	Objektiv
 	Output To	Ausgabe in
 	Duplicate Layer	Ebene duplizieren
 	Contract	Verkleinern
+
+	Animation Options	Animationsoptionen
+	Entire Document	Gesamtes Dokument
+	Filter Options	Filteroptionen
+	Layer Bounds	Ebenenbegrenzungen
+	Layers Panel Options	Optionen des Ebenenbedienfelds
+	Lock Layers	Ebenen sperren
+	New Artboard…	Neue Zeichenfläche…
+	New Group…	Neue Gruppe…
+	New Layer…	Neue Ebene…
+	Panel Options…	Bedienfeldoptionen…
+	Prevent Auto-Nesting	Automatisches Verschachteln verhindern
+	Show Layers	Ebenen einblenden
+	Thumbnail Contents	Miniaturinhalt
+	Thumbnail Size	Miniaturgröße
+	Expand New Effects	Neue Effekte aufklappen
+	Add “copy” to Copied Layers and Groups	„Kopie“ zu kopierten Ebenen und Gruppen hinzufügen
+	Preview on canvas when reordering layers	Vorschau auf der Arbeitsfläche beim Neuanordnen von Ebenen
+	Show layer mask badges	Ebenenmasken-Abzeichen anzeigen
 	Loading fonts…	Schriften werden geladen…
 	Response curve	Reaktionskurve
 	Tool	Werkzeug
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index 74ab59cba5..4566257947 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -3752,6 +3752,22 @@ cameraData	Lens	Φακός
 	Mirror	Κατοπτρισμός
 	Output Settings	Ρυθμίσεις εξόδου
 	Output To	Έξοδος σε
+
+	Animation Options	Επιλογές κίνησης
+	Entire Document	Ολόκληρο έγγραφο
+	Filter Options	Επιλογές φίλτρου
+	Layer Bounds	Όρια επιπέδου
+	Layers Panel Options	Επιλογές πίνακα επιπέδων
+	New Artboard…	Νέος πίνακας σχεδίασης…
+	New Group…	Νέα ομάδα…
+	Prevent Auto-Nesting	Αποτροπή αυτόματης ένθεσης
+	Show Layers	Εμφάνιση επιπέδων
+	Thumbnail Contents	Περιεχόμενο μικρογραφιών
+	Thumbnail Size	Μέγεθος μικρογραφιών
+	Expand New Effects	Ανάπτυξη νέων εφέ
+	Add “copy” to Copied Layers and Groups	Προσθήκη «αντίγραφο» σε αντιγραμμένα επίπεδα και ομάδες
+	Preview on canvas when reordering layers	Προεπισκόπηση στον καμβά κατά την αναδιάταξη επιπέδων
+	Show layer mask badges	Εμφάνιση σημάτων μασκών επιπέδου
 	Loading fonts…	Φόρτωση γραμματοσειρών…
 	Response curve	Καμπύλη απόκρισης
 	Simulate Pressure	Προσομοίωση πίεσης
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index cbbbbc14fa..f5795d4f15 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -2738,6 +2738,25 @@ cameraData	Lens	Objetivo
 	Mirror	Reflejar
 	Output Settings	Ajustes de salida
 	Output To	Salida a
+
+	Animation Options	Opciones de animación
+	Entire Document	Documento entero
+	Filter Options	Opciones de filtro
+	Layer Bounds	Límites de capa
+	Layers Panel Options	Opciones del panel Capas
+	Lock Layers	Bloquear capas
+	New Artboard…	Nueva mesa de trabajo…
+	New Group…	Nuevo grupo…
+	New Layer…	Nueva capa…
+	Panel Options…	Opciones de panel…
+	Prevent Auto-Nesting	Impedir anidación automática
+	Show Layers	Mostrar capas
+	Thumbnail Contents	Contenido de miniaturas
+	Thumbnail Size	Tamaño de miniaturas
+	Expand New Effects	Expandir nuevos efectos
+	Add “copy” to Copied Layers and Groups	Añadir «copia» a las capas y grupos duplicados
+	Preview on canvas when reordering layers	Previsualizar en el lienzo al reordenar capas
+	Show layer mask badges	Mostrar insignias de máscaras de capa
 	Loading fonts…	Cargando fuentes…
 	Response curve	Curva de respuesta
 	Tool	Herramienta
@@ -2831,7 +2850,6 @@ curves	Smooth	Suavizar
 @id	select.all	Seleccionar todo
 	Delete Smart Filters	Eliminar filtros inteligentes
 	Enable Smart Filters	Activar filtros inteligentes
-	New Layer…	Nueva capa…
 	Delete Layer…	Eliminar capa…
 	Select Similar Colors	Seleccionar colores similares
 	Canvas rotation	Rotación del lienzo
@@ -2908,7 +2926,6 @@ curves	Smooth	Suavizar
 	Automatically Create New Snapshot When Saving	Crear automáticamente una instantánea nueva al guardar
 	Show New Snapshot Dialog by Default	Mostrar de forma predeterminada el cuadro de diálogo Nueva instantánea
 	Clear History	Borrar historial
-	Panel Options…	Opciones de panel…
 	View menu	Menú Vista
 	Keep view in sync	Mantener la vista sincronizada
 	{zoom}%	{zoom}%
@@ -3819,7 +3836,6 @@ layerLabel	No Color	Sin color
 	Lens Flare	Destello
 	Lighting Effects	Efectos de iluminación
 	Liquify	Licuar
-	Lock Layers	Bloquear capas
 	Lum	Lum
 	Match Color	Igualar color
 	Merge to HDR Pro	Combinar en HDR Pro
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index e8164e9674..f8b32f7965 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -3074,6 +3074,23 @@ cameraData	Lens	Objectif
 	Output To	Sortie vers
 	Duplicate Layer	Dupliquer le calque
 	Contract	Contracter
+
+	Animation Options	Options d’animation
+	Entire Document	Document entier
+	Filter Options	Options de filtrage
+	Layer Bounds	Limites du calque
+	Layers Panel Options	Options du panneau Calques
+	Lock Layers	Verrouiller les calques
+	New Artboard…	Nouveau plan de travail…
+	New Group…	Nouveau groupe…
+	Prevent Auto-Nesting	Empêcher l’imbrication automatique
+	Show Layers	Afficher les calques
+	Thumbnail Contents	Contenu des vignettes
+	Thumbnail Size	Taille des vignettes
+	Expand New Effects	Développer les nouveaux effets
+	Add “copy” to Copied Layers and Groups	Ajouter « copie » aux calques et groupes dupliqués
+	Preview on canvas when reordering layers	Prévisualiser sur la zone de travail lors du réagencement des calques
+	Show layer mask badges	Afficher les badges des masques de fusion
 	Loading fonts…	Chargement des polices…
 	Response curve	Courbe de réponse
 	Tool	Outil
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index fe21a5fbf1..1d2b05d196 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -4151,6 +4151,23 @@ cameraRaw	Yellow	Sárga
 	Lines/Inch	Vonal/hüvelyk
 	Lines/Centimeter	Vonal/centiméter
 	Ellipse	Ellipszis
+
+# Layers panel options and Smart Filter editors
+	Add “copy” to Copied Layers and Groups	„másolat” hozzáadása a másolt rétegekhez és csoportokhoz
+	Animation Options	Animációs beállítások
+	Entire Document	Teljes dokumentum
+	Expand New Effects	Új effektusok kibontása
+	Filter Options	Szűrési beállítások
+	Layer Bounds	Réteghatárok
+	Layers Panel Options	Rétegek panel beállításai
+	New Artboard…	Új rajztábla…
+	New Group…	Új csoport…
+	Prevent Auto-Nesting	Automatikus beágyazás tiltása
+	Preview on canvas when reordering layers	Előnézet a vásznon a rétegek átrendezésekor
+	Show Layers	Rétegek megjelenítése
+	Show layer mask badges	Rétegmaszk-jelvények megjelenítése
+	Thumbnail Contents	Bélyegkép tartalma
+	Thumbnail Size	Bélyegképméret
 	Accept and Go to Conflict	Elfogadás és ugrás az ütközéshez
 	Changes undone.	Változások visszavonva.
 	Choose a new shortcut for this command, or leave it without one.	Válasszon új billentyűparancsot ehhez a parancshoz, vagy hagyja nélküle.
diff --git a/crates/ui-egui/src/i18n/id.tsv b/crates/ui-egui/src/i18n/id.tsv
index 0feaf28398..51bd0b5a46 100644
--- a/crates/ui-egui/src/i18n/id.tsv
+++ b/crates/ui-egui/src/i18n/id.tsv
@@ -3061,6 +3061,23 @@ cameraData	Lens	Lensa
 	Output To	Keluaran Ke
 	Duplicate Layer	Duplikat Layer
 	Contract	Ciutkan
+
+	Animation Options	Opsi Animasi
+	Entire Document	Seluruh Dokumen
+	Filter Options	Opsi Filter
+	Layer Bounds	Batas Lapisan
+	Layers Panel Options	Opsi Panel Lapisan
+	Lock Layers	Kunci Lapisan
+	New Artboard…	Artboard Baru…
+	New Group…	Grup Baru…
+	Prevent Auto-Nesting	Cegah Pengelompokan Otomatis
+	Show Layers	Tampilkan Lapisan
+	Thumbnail Contents	Isi Gambar Mini
+	Thumbnail Size	Ukuran Gambar Mini
+	Expand New Effects	Perluas Efek Baru
+	Add “copy” to Copied Layers and Groups	Tambahkan “salinan” ke Lapisan dan Grup yang Disalin
+	Preview on canvas when reordering layers	Pratinjau pada kanvas saat mengurutkan ulang lapisan
+	Show layer mask badges	Tampilkan Lencana Masker Lapisan
 	Loading fonts…	Memuat font…
 	Response curve	Kurva respons
 	Tool	Alat
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index 57b58861a9..955947620d 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -2726,6 +2726,22 @@ cameraData	Lens	Obiettivo
 	Mirror	Rifletti
 	Output Settings	Impostazioni di output
 	Output To	Output in
+
+	Animation Options	Opzioni animazione
+	Entire Document	Documento intero
+	Filter Options	Opzioni filtro
+	Layer Bounds	Limiti livello
+	Layers Panel Options	Opzioni pannello Livelli
+	New Artboard…	Nuova tavola da disegno…
+	New Group…	Nuovo gruppo…
+	Prevent Auto-Nesting	Impedisci annidamento automatico
+	Show Layers	Mostra livelli
+	Thumbnail Contents	Contenuto miniature
+	Thumbnail Size	Dimensione miniature
+	Expand New Effects	Espandi nuovi effetti
+	Add “copy” to Copied Layers and Groups	Aggiungi «copia» ai livelli e ai gruppi duplicati
+	Preview on canvas when reordering layers	Anteprima sulla tela durante il riordino dei livelli
+	Show layer mask badges	Mostra distintivi delle maschere di livello
 	Loading fonts…	Caricamento font…
 	Response curve	Curva di risposta
 	Tool	Strumento
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index 28fe0ccc60..165c491931 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -3667,6 +3667,22 @@ cameraData	Lens	レンズ
 	Mirror	ミラー
 	Output Settings	出力設定
 	Output To	出力先
+
+	Animation Options	アニメーションオプション
+	Entire Document	ドキュメント全体
+	Filter Options	フィルターオプション
+	Layer Bounds	レイヤーの境界
+	Layers Panel Options	レイヤーパネルオプション
+	New Artboard…	新規アートボード…
+	New Group…	新規グループ…
+	Prevent Auto-Nesting	自動的な入れ子を防ぐ
+	Show Layers	レイヤーを表示
+	Thumbnail Contents	サムネールの内容
+	Thumbnail Size	サムネールのサイズ
+	Expand New Effects	新しい効果を展開
+	Add “copy” to Copied Layers and Groups	コピーしたレイヤーとグループの名前に「コピー」を追加
+	Preview on canvas when reordering layers	レイヤーの並べ替え時にカンバスでプレビュー
+	Show layer mask badges	レイヤーマスクのバッジを表示
 	Loading fonts…	フォントを読み込み中…
 	Response curve	応答カーブ
 	Simulate Pressure	筆圧をシミュレート
diff --git a/crates/ui-egui/src/i18n/ko.tsv b/crates/ui-egui/src/i18n/ko.tsv
index e9163eba80..880670699a 100644
--- a/crates/ui-egui/src/i18n/ko.tsv
+++ b/crates/ui-egui/src/i18n/ko.tsv
@@ -3242,6 +3242,25 @@ cameraData	Lens	렌즈
 	Mirror	미러
 	Output Settings	출력 설정
 	Output To	출력 위치
+
+	Animation Options	애니메이션 옵션
+	Entire Document	전체 문서
+	Filter Options	필터 옵션
+	Layer Bounds	레이어 경계
+	Layers Panel Options	레이어 패널 옵션
+	New Artboard…	새 아트보드…
+	New Group	새 그룹
+	New Group…	새 그룹…
+	New Layer…	새 레이어…
+	Panel Options…	패널 옵션…
+	Prevent Auto-Nesting	자동 중첩 방지
+	Show Layers	레이어 표시
+	Thumbnail Contents	축소판 내용
+	Thumbnail Size	축소판 크기
+	Expand New Effects	새 효과 펼치기
+	Add “copy” to Copied Layers and Groups	복사한 레이어 및 그룹에 “복사” 추가
+	Preview on canvas when reordering layers	레이어 순서 변경 시 캔버스에서 미리보기
+	Show layer mask badges	레이어 마스크 배지 표시
 	Loading fonts…	글꼴 불러오는 중…
 	Response curve	응답 곡선
 	Simulate Pressure	압력 시뮬레이션
diff --git a/crates/ui-egui/src/i18n/nl.tsv b/crates/ui-egui/src/i18n/nl.tsv
index 9b20a49dee..793ac9d27f 100644
--- a/crates/ui-egui/src/i18n/nl.tsv
+++ b/crates/ui-egui/src/i18n/nl.tsv
@@ -3811,6 +3811,22 @@ cameraData	Lens	Lens
 	Mirror	Spiegelen
 	Output Settings	Uitvoerinstellingen
 	Output To	Uitvoer naar
+
+	Animation Options	Animatieopties
+	Entire Document	Hele document
+	Filter Options	Filteropties
+	Layer Bounds	Laaggrenzen
+	Layers Panel Options	Opties van het deelvenster Lagen
+	New Artboard…	Nieuw tekengebied…
+	New Group…	Nieuwe groep…
+	Prevent Auto-Nesting	Automatisch nesten voorkomen
+	Show Layers	Lagen tonen
+	Thumbnail Contents	Inhoud van miniaturen
+	Thumbnail Size	Grootte van miniaturen
+	Expand New Effects	Nieuwe effecten uitvouwen
+	Add “copy” to Copied Layers and Groups	„kopie” toevoegen aan gekopieerde lagen en groepen
+	Preview on canvas when reordering layers	Voorvertoning op canvas bij herschikken van lagen
+	Show layer mask badges	Badges voor laagmaskers tonen
 	Loading fonts…	Lettertypen laden…
 	Response curve	Responscurve
 	Simulate Pressure	Druk simuleren
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index b223c0cd20..8697090cbb 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -3669,6 +3669,22 @@ cameraData	Lens	Obiektyw
 	Mirror	Odbicie lustrzane
 	Output Settings	Ustawienia wyjścia
 	Output To	Wyjście do
+
+	Animation Options	Opcje animacji
+	Entire Document	Cały dokument
+	Filter Options	Opcje filtrowania
+	Layer Bounds	Granice warstwy
+	Layers Panel Options	Opcje panelu Warstwy
+	New Artboard…	Nowy obszar roboczy…
+	New Group…	Nowa grupa…
+	Prevent Auto-Nesting	Zapobiegaj automatycznemu zagnieżdżaniu
+	Show Layers	Pokaż warstwy
+	Thumbnail Contents	Zawartość miniaturek
+	Thumbnail Size	Rozmiar miniaturek
+	Expand New Effects	Rozwijaj nowe efekty
+	Add “copy” to Copied Layers and Groups	Dodawaj „kopia” do skopiowanych warstw i grup
+	Preview on canvas when reordering layers	Podgląd na obszarze roboczym podczas zmiany kolejności warstw
+	Show layer mask badges	Pokaż odznaki masek warstw
 	Loading fonts…	Wczytywanie czcionek…
 	Response curve	Krzywa odpowiedzi
 	Simulate Pressure	Symuluj nacisk
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index 5319f4f74d..501aa53067 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -3078,6 +3078,22 @@ cameraData	Lens	Lente
 	New Layer	Nova camada
 	Duplicate Layer	Duplicar camada
 	Contract	Contrair
+
+	Animation Options	Opções de animação
+	Entire Document	Documento inteiro
+	Filter Options	Opções de filtro
+	Layer Bounds	Limites da camada
+	Layers Panel Options	Opções do painel Camadas
+	New Artboard…	Nova prancheta…
+	New Group…	Novo grupo…
+	Prevent Auto-Nesting	Impedir aninhamento automático
+	Show Layers	Mostrar camadas
+	Thumbnail Contents	Conteúdo das miniaturas
+	Thumbnail Size	Tamanho das miniaturas
+	Expand New Effects	Expandir novos efeitos
+	Add “copy” to Copied Layers and Groups	Adicionar “cópia” às camadas e grupos copiados
+	Preview on canvas when reordering layers	Pré-visualizar na tela ao reordenar camadas
+	Show layer mask badges	Mostrar emblemas de máscaras de camada
 	Loading fonts…	Carregando fontes…
 	Response curve	Curva de resposta
 	Tool	Ferramenta
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index fb0af355c9..6ef050b669 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -2998,6 +2998,23 @@ cameraData	Lens	Объектив
 	Output To	Вывод в
 	Duplicate Layer	Дубликат слоя
 	Contract	Сжать
+
+	Animation Options	Параметры анимации
+	Entire Document	Весь документ
+	Filter Options	Параметры фильтра
+	Layer Bounds	Границы слоя
+	Layers Panel Options	Параметры панели «Слои»
+	Lock Layers	Блокировка слоёв
+	New Artboard…	Новая монтажная область…
+	New Group…	Новая группа…
+	Prevent Auto-Nesting	Запретить автоматическое вложение
+	Show Layers	Показать слои
+	Thumbnail Contents	Содержимое миниатюр
+	Thumbnail Size	Размер миниатюр
+	Expand New Effects	Раскрывать новые эффекты
+	Add “copy” to Copied Layers and Groups	Добавлять «копия» к дублированным слоям и группам
+	Preview on canvas when reordering layers	Предпросмотр на холсте при изменении порядка слоёв
+	Show layer mask badges	Показывать значки типов масок слоя
 	Loading fonts…	Загрузка шрифтов…
 	Response curve	Кривая отклика
 	Tool	Инструмент
diff --git a/crates/ui-egui/src/i18n/sr.tsv b/crates/ui-egui/src/i18n/sr.tsv
index 2b02f33bc2..f1196f3969 100644
--- a/crates/ui-egui/src/i18n/sr.tsv
+++ b/crates/ui-egui/src/i18n/sr.tsv
@@ -4305,6 +4305,23 @@ shape	Appearance	Izgled
 	Lines/Inch	Linija/inč
 	Lines/Centimeter	Linija/centimetar
 	Ellipse	Elipsa
+
+# Layers panel options
+	Add “copy” to Copied Layers and Groups	Dodaj „kopija” kopiranim slojevima i grupama
+	Animation Options	Opcije animacije
+	Entire Document	Ceo dokument
+	Expand New Effects	Proširi nove efekte
+	Filter Options	Opcije filtera
+	Layer Bounds	Granice sloja
+	Layers Panel Options	Opcije panela Slojevi
+	New Artboard…	Nova radna tabla…
+	New Group…	Nova grupa…
+	Prevent Auto-Nesting	Spreči automatsko ugnežđavanje
+	Preview on canvas when reordering layers	Pregled na platnu pri promeni redosleda slojeva
+	Show Layers	Prikaži slojeve
+	Show layer mask badges	Prikaži oznake maske sloja
+	Thumbnail Contents	Sadržaj sličice
+	Thumbnail Size	Veličina sličice
 	Accept and Go to Conflict	Prihvati i idi na sukob
 	Changes undone.	Izmene su poništene.
 	Choose a new shortcut for this command, or leave it without one.	Izaberite novu prečicu za ovu komandu ili je ostavite bez prečice.
diff --git a/crates/ui-egui/src/i18n/tr.tsv b/crates/ui-egui/src/i18n/tr.tsv
index d3f6faf4a8..cf88721bd3 100644
--- a/crates/ui-egui/src/i18n/tr.tsv
+++ b/crates/ui-egui/src/i18n/tr.tsv
@@ -3962,6 +3962,23 @@ cameraData	Lens	Lens
 	Lines/Inch	Çizgi/İnç
 	Lines/Centimeter	Çizgi/Santimetre
 	Ellipse	Elips
+
+# Layers panel options and Smart Filter editors
+	Add “copy” to Copied Layers and Groups	Kopyalanan Katman ve Gruplara “kopya” Ekle
+	Animation Options	Animasyon Seçenekleri
+	Entire Document	Tüm Belge
+	Expand New Effects	Yeni Efektleri Genişlet
+	Filter Options	Filtre Seçenekleri
+	Layer Bounds	Katman Sınırları
+	Layers Panel Options	Katmanlar Paneli Seçenekleri
+	New Artboard…	Yeni Çalışma Yüzeyi…
+	New Group…	Yeni Grup…
+	Prevent Auto-Nesting	Otomatik Yerleştirmeyi Önle
+	Preview on canvas when reordering layers	Katmanları yeniden sıralarken kanvasta önizle
+	Show Layers	Katmanları Göster
+	Show layer mask badges	Katman maskesi rozetlerini göster
+	Thumbnail Contents	Küçük Resim İçeriği
+	Thumbnail Size	Küçük Resim Boyutu
 	Accept and Go to Conflict	Kabul Et ve Çakışmaya Git
 	Changes undone.	Değişiklikler geri alındı.
 	Choose a new shortcut for this command, or leave it without one.	Bu komut için yeni bir kısayol seçin veya kısayolsuz bırakın.
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index bc5e98c2a9..5f0d70f1ff 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -3743,6 +3743,22 @@ cameraData	Lens	Об'єктив
 	Mirror	Віддзеркалення
 	Output Settings	Параметри виводу
 	Output To	Вивести в
+
+	Animation Options	Параметри анімації
+	Entire Document	Увесь документ
+	Filter Options	Параметри фільтрів
+	Layer Bounds	Межі шару
+	Layers Panel Options	Параметри панелі «Шари»
+	New Artboard…	Нова монтажна область…
+	New Group…	Нова група…
+	Prevent Auto-Nesting	Заборонити автоматичне вкладення
+	Show Layers	Показати шари
+	Thumbnail Contents	Вміст мініатюр
+	Thumbnail Size	Розмір мініатюр
+	Expand New Effects	Розгортати нові ефекти
+	Add “copy” to Copied Layers and Groups	Додавати «копія» до скопійованих шарів і груп
+	Preview on canvas when reordering layers	Попередній перегляд на полотні під час зміни порядку шарів
+	Show layer mask badges	Показувати позначки масок шарів
 	Loading fonts…	Завантаження шрифтів…
 	Response curve	Крива відгуку
 	Simulate Pressure	Імітувати натиск
diff --git a/crates/ui-egui/src/i18n/vi.tsv b/crates/ui-egui/src/i18n/vi.tsv
index efba5ce8cb..f3ade594c3 100644
--- a/crates/ui-egui/src/i18n/vi.tsv
+++ b/crates/ui-egui/src/i18n/vi.tsv
@@ -3722,6 +3722,24 @@ curves	Smooth	Làm mượt
 	Lines/Inch	Đường/inch
 	Lines/Centimeter	Đường/centimet
 	Ellipse	Elip
+
+# Layers panel options and Smart Filter editors
+	Add “copy” to Copied Layers and Groups	Thêm “bản sao” vào lớp và nhóm được sao chép
+	Animation Options	Tùy chọn hoạt ảnh
+	Entire Document	Toàn bộ tài liệu
+	Expand New Effects	Mở rộng hiệu ứng mới
+	Filter Options	Tùy chọn bộ lọc
+	Layer Bounds	Đường biên lớp
+	Layers Panel Options	Tùy chọn bảng Lớp
+	New Artboard…	Bảng vẽ mới…
+	New Group…	Nhóm mới…
+	Panel Options…	Tùy chọn bảng…
+	Prevent Auto-Nesting	Chặn tự lồng
+	Preview on canvas when reordering layers	Xem trước trên Canvas khi sắp xếp lại lớp
+	Show Layers	Hiện các lớp
+	Show layer mask badges	Hiện huy hiệu mặt nạ lớp
+	Thumbnail Contents	Nội dung hình thu nhỏ
+	Thumbnail Size	Kích thước hình thu nhỏ
 	Accept and Go to Conflict	Chấp nhận và đến xung đột
 	Changes undone.	Đã hoàn tác thay đổi.
 	Choose a new shortcut for this command, or leave it without one.	Chọn phím tắt mới cho lệnh này, hoặc để lệnh không có phím tắt.
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index f5f2aa37b0..030fa0103e 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -2674,6 +2674,26 @@ cameraData	Lens	镜头
 	Output To	输出到
 	Duplicate Layer	复制图层
 	Contract	收缩
+
+	Animation Options	动画选项
+	Entire Document	整个文档
+	Filter Options	过滤选项
+	Layer Bounds	图层边界
+	Layers Panel Options	图层面板选项
+	Lock Layers	锁定图层
+	New Artboard…	新建画板…
+	New Group	新建组
+	New Group…	新建组…
+	New Layer…	新建图层…
+	Panel Options…	面板选项…
+	Prevent Auto-Nesting	防止自动嵌套
+	Show Layers	显示图层
+	Thumbnail Contents	缩略图内容
+	Thumbnail Size	缩略图大小
+	Expand New Effects	展开新效果
+	Add “copy” to Copied Layers and Groups	为复制的图层和组添加“副本”
+	Preview on canvas when reordering layers	重新排列图层时在画布上预览
+	Show layer mask badges	显示图层蒙版标记
 	Loading fonts…	正在加载字体…
 	Response curve	响应曲线
 	Tool	工具
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 0e81f6b4ff..4d065bc7cc 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -2644,6 +2644,26 @@ cameraData	Lens	鏡頭
 	Output To	輸出至
 	Duplicate Layer	複製圖層
 	Contract	縮減
+
+	Animation Options	動畫選項
+	Entire Document	整份文件
+	Filter Options	篩選選項
+	Layer Bounds	圖層邊界
+	Layers Panel Options	圖層面板選項
+	Lock Layers	鎖定圖層
+	New Artboard…	新增工作區域…
+	New Group	新增群組
+	New Group…	新增群組…
+	New Layer…	新增圖層…
+	Panel Options…	面板選項…
+	Prevent Auto-Nesting	防止自動巢狀
+	Show Layers	顯示圖層
+	Thumbnail Contents	縮圖內容
+	Thumbnail Size	縮圖大小
+	Expand New Effects	展開新效果
+	Add “copy” to Copied Layers and Groups	為複製的圖層和群組加上「副本」
+	Preview on canvas when reordering layers	重新排列圖層時在畫布上預覽
+	Show layer mask badges	顯示圖層遮色片標記
 	Loading fonts…	正在載入字體…
 	Response curve	回應曲線
 	Tool	工具
diff --git a/crates/ui-egui/src/layer_row_ui.rs b/crates/ui-egui/src/layer_row_ui.rs
index 4bed6a7cc4..5257a554d9 100644
--- a/crates/ui-egui/src/layer_row_ui.rs
+++ b/crates/ui-egui/src/layer_row_ui.rs
@@ -42,6 +42,8 @@ pub enum Indicator {
 pub struct RowRects {
     pub layer: u64,
     pub row: Rect,
+    /// Visible layer thumbnail; None when thumbnails are disabled.
+    pub thumbnail: Option<Rect>,
     /// The name as painted (after truncation); `None` when there was no room for it.
     pub name: Option<Rect>,
     pub indicators: Vec<(Indicator, Rect)>,
@@ -206,10 +208,60 @@ pub fn label(painter: &Painter, x: f32, cy: f32, right: f32, text: &str, font: F
     Some(r)
 }
 
-/// The Layers panel's own items at the top of its panel menu (Photoshop's flyout).
+/// Photoshop-style Layers flyout commands. The dock owns tab-group controls, not this menu.
 pub fn panel_menu(app: &mut crate::PhotocraftApp, ui: &mut egui::Ui) {
-    let can = app.session.is_enabled("layer.setExpanded");
-    if ui.add_enabled(can, egui::Button::new(tl!("Collapse All Groups"))).clicked() {
+    use crate::layers_panel_ui::run_menu_command;
+    use crate::state::LayersPanelDialog;
+
+    let has_doc = app.session.active().is_some();
+    if ui.add_enabled(has_doc, egui::Button::new(tl!("New Layer…"))).clicked() {
+        app.ui.layers_panel_dialog = Some(LayersPanelDialog::NewLayer(String::new()));
+        ui.close();
+    }
+    if ui.add_enabled(has_doc, egui::Button::new(tl!("New Group…"))).clicked() {
+        app.ui.layers_panel_dialog = Some(LayersPanelDialog::NewGroup(String::new()));
+        ui.close();
+    }
+    ui.separator();
+    run_menu_command(app, ui, tl!("Flatten Image"), "layer.flattenImage");
+    ui.separator();
+    if ui.add_enabled(app.session.is_enabled("layer.lockLayers"), egui::Button::new(tl!("Lock Layers…"))).clicked() {
+        app.ui.layers_panel_dialog = Some(LayersPanelDialog::LockLayers { transparency: false, pixels: false, position: false, artboard: false, all: true });
+        ui.close();
+    }
+    run_menu_command(app, ui, tl!("Rename Layer…"), "layer.renameLayer");
+    let any_hidden = app.session.active().is_some_and(|st| st.selected_layers().iter().any(|id| st.doc.layer(*id).is_some_and(|l| !l.visible)));
+    if any_hidden {
+        run_menu_command(app, ui, tl!("Show Layers"), "layer.showLayers");
+    } else {
+        run_menu_command(app, ui, tl!("Hide Layers"), "layer.hideLayers");
+    }
+    ui.separator();
+    run_menu_command(app, ui, tl!("New Artboard…"), "layer.new.artboard");
+    ui.separator();
+    ui.menu_button(tl!("Filter Options"), |ui| {
+        let mut show = app.ui.layers_panel_options.show_filters;
+        if ui.checkbox(&mut show, tl!("Show")).changed() {
+            app.ui.layers_panel_options.show_filters = show;
+            crate::layers_panel_ui::persist_options(app);
+            ui.close();
+        }
+    });
+    // Animation Options control Photoshop's frame-unification buttons. PhotoCraft's Layers
+    // panel does not expose those buttons; do not offer nonfunctional toggles.
+    ui.add_enabled_ui(false, |ui| {
+        ui.menu_button(tl!("Animation Options"), |_ui| {});
+    });
+    if ui.button(tl!("Panel Options…")).clicked() {
+        let mut options = app.ui.layers_panel_options.clone();
+        options.thumbnail_contents = crate::layers_panel_ui::thumbnail_contents(app);
+        app.ui.layers_panel_dialog = Some(LayersPanelDialog::PanelOptions(options));
+        ui.close();
+    }
+    ui.separator();
+    // Preserve PhotoCraft's existing group disclosure action when expanding the flyout.
+    let can_collapse = app.session.is_enabled("layer.setExpanded");
+    if ui.add_enabled(can_collapse, egui::Button::new(tl!("Collapse All Groups"))).clicked() {
         if let Err(e) = app.run("layer.setExpanded", json!({"all": true, "expanded": false})) {
             app.ui.status = e;
             app.ui.status_error = true;
diff --git a/crates/ui-egui/src/layer_row_ui/tests.rs b/crates/ui-egui/src/layer_row_ui/tests.rs
index 6ec1241b46..0bd2c7b097 100644
--- a/crates/ui-egui/src/layer_row_ui/tests.rs
+++ b/crates/ui-egui/src/layer_row_ui/tests.rs
@@ -537,6 +537,35 @@ fn press_drag_release_on_the_fx_button_opens_that_style() {
     assert!(effects.iter().any(|e| e["kind"] == json!("dropShadow")), "on Drop Shadow: {effects:?}");
 }
 
+/// Integration regression: a display preference must resize the *actual painted*
+/// thumbnails and row hitboxes, not only its Preview dialog.
+#[test]
+fn panel_thumbnail_sizes_change_real_row_geometry() {
+    use crate::state::LayerThumbnailSize;
+    let mut session = photocraft_engine::Session::new();
+    session.execute("file.new", json!({"width": 64, "height": 48})).unwrap();
+    session.execute("layer.new.layer", json!({"name": "Photo"})).unwrap();
+    session.execute("edit.fill", json!({"color": "#9acb32"})).unwrap();
+    let layer = session.active().unwrap().active_layer.unwrap();
+    let mut h = harness(session, 1.0, "promedium", 290.0);
+    for (size, expected_thumb, expected_row) in [
+        (LayerThumbnailSize::None, 0.0, 23.0),
+        (LayerThumbnailSize::Small, 18.0, 32.0),
+        (LayerThumbnailSize::Medium, 24.0, 32.0),
+        (LayerThumbnailSize::Large, 48.0, 56.0),
+    ] {
+        h.state_mut().ui.layers_panel_options.thumbnail_size = size;
+        h.run_steps(5);
+        let found = recorded(&h.ctx).into_iter().find(|r| r.layer == layer.0).expect("visible layer row");
+        assert!((found.row.height() - expected_row).abs() < 0.1, "{size:?}: row {}", found.row.height());
+        match found.thumbnail {
+            Some(rect) => assert!((rect.width() - expected_thumb).abs() < 0.1, "{size:?}: thumbnail {}", rect.width()),
+            None => assert_eq!(expected_thumb, 0.0, "{size:?} should display a thumbnail"),
+        }
+        assert!(found.name.is_some(), "{size:?}: layer name still visible");
+    }
+}
+
 /// One layer per lock, each with only that lock set (#4158).
 fn one_lock_each() -> (photocraft_engine::Session, Vec<(&'static str, u64)>) {
     let mut s = photocraft_engine::Session::new();
diff --git a/crates/ui-egui/src/layers_panel_ui.rs b/crates/ui-egui/src/layers_panel_ui.rs
new file mode 100644
index 0000000000..43955812dd
--- /dev/null
+++ b/crates/ui-egui/src/layers_panel_ui.rs
@@ -0,0 +1,454 @@
+//! Layers panel flyout and display preferences, observed from Photoshop's panel menu.
+//! UI options do not edit document pixels or add history steps.
+use egui::{self, Context, Ui};
+use photocraft_doc::Document;
+use serde_json::json;
+
+use crate::PhotocraftApp;
+use crate::state::{LayerThumbnailContents, LayerThumbnailSize, LayersPanelDialog, LayersPanelOptions};
+
+const OPTIONS_PREF: &str = "ui.layersPanelOptions";
+
+/// Save independently of Workspace > Remember Workspace Changes, as Photoshop does.
+pub fn persist_options(app: &mut PhotocraftApp) {
+    if let Ok(value) = serde_json::to_value(&app.ui.layers_panel_options) {
+        app.session.prefs.edit(|p| {
+            p.dialogs.insert(OPTIONS_PREF.into(), value);
+        });
+    }
+}
+
+/// Restore independently from a saved workspace. Older preferences retain the defaults.
+pub fn restore_options(app: &mut PhotocraftApp) {
+    if let Some(opts) = app.session.prefs().dialogs.get(OPTIONS_PREF)
+        && let Ok(value) = serde_json::from_value(opts.clone())
+    {
+        app.ui.layers_panel_options = value;
+    }
+}
+
+/// The real menu command dispatcher handles rename's in-place editor and other shell routing.
+pub fn run_menu_command(app: &mut PhotocraftApp, ui: &mut Ui, label: &str, id: &str) {
+    if ui.add_enabled(app.session.is_enabled(id), egui::Button::new(label)).clicked() {
+        let ctx = ui.ctx().clone();
+        if let Err(e) = crate::menus::invoke(app, &ctx, id, json!({})) {
+            app.ui.status = e;
+            app.ui.status_error = true;
+        }
+        ui.close();
+    }
+}
+
+/// Thumbnail Contents as the shared preference has it: Layer Bounds is Clip Thumbnails to Layer
+/// Bounds (#4281), which frames each layer's pixels instead of the canvas.
+pub fn thumbnail_contents(app: &PhotocraftApp) -> LayerThumbnailContents {
+    if app.session.prefs().interface.clip_thumbnails_to_layer_bounds { LayerThumbnailContents::LayerBounds } else { LayerThumbnailContents::EntireDocument }
+}
+
+/// Panel Options › OK: the panel's own options, and Thumbnail Contents into the shared preference.
+fn apply_options(app: &mut PhotocraftApp, options: LayersPanelOptions) -> Result<(), String> {
+    let contents = options.thumbnail_contents;
+    app.ui.layers_panel_options = options;
+    persist_options(app);
+    if contents == thumbnail_contents(app) {
+        return Ok(());
+    }
+    let clip = contents == LayerThumbnailContents::LayerBounds;
+    app.run("prefs.set", json!({"path": "interface.clipThumbnailsToLayerBounds", "value": clip})).map(|_| ())
+}
+
+/// Preview cache recomputes only when hovering a new target, not each pointer frame.
+/// Compositor sees it as a temporary document and never commits it to history.
+pub(crate) struct ReorderPreview {
+    pub source: photocraft_doc::DocId,
+    pub revision: u64,
+    pub signature: u64,
+    pub key: u64,
+    pub document: std::sync::Arc<Document>,
+}
+
+/// Cache the on-canvas preview of the layer drop in `payload` (a `layer.moveTo` request), unless Preview on Canvas is off.
+/// Marks the destination as hovered every frame; the preview itself is rebuilt only when the target changes.
+pub(crate) fn preview_reorder(app: &mut PhotocraftApp, payload: &serde_json::Value) {
+    if !app.ui.layers_panel_options.preview_on_canvas_when_reordering_layers {
+        app.reorder_preview = None;
+        return;
+    }
+    // Mark the destination as hovered even if the cached preview already matches.
+    app.reorder_preview_hit = true;
+    let Some(st) = app.session.active() else { return };
+    let mut hasher = std::collections::hash_map::DefaultHasher::new();
+    use std::hash::{Hash, Hasher};
+    payload.to_string().hash(&mut hasher);
+    st.doc.id.0.hash(&mut hasher);
+    st.revision.hash(&mut hasher);
+    let signature = hasher.finish();
+    if app.reorder_preview.as_ref().is_some_and(|cache| cache.signature == signature) {
+        return;
+    }
+    let (source, revision) = (st.doc.id, st.revision);
+    let add_copy = app.ui.layers_panel_options.add_copy_to_copied_layers_and_groups;
+    let preview = photocraft_engine::layer_multi_cmds::preview_move(&st.doc, payload, add_copy);
+    app.reorder_preview = preview.map(|document| ReorderPreview {
+        source,
+        revision,
+        signature,
+        key: (1u64 << 60) | (signature & ((1u64 << 60) - 1)),
+        document: std::sync::Arc::new(document),
+    });
+}
+
+/// The cached reorder preview and its compositor cache key for document `index`, if it was built for that document's current revision.
+pub(crate) fn display_reorder(app: &PhotocraftApp, index: usize) -> Option<(std::sync::Arc<Document>, u64)> {
+    if !app.ui.layers_panel_options.preview_on_canvas_when_reordering_layers {
+        return None;
+    }
+    let st = app.session.documents().get(index)?;
+    let cached = app.reorder_preview.as_ref()?;
+    (cached.source == st.doc.id && cached.revision == st.revision).then(|| (cached.document.clone(), cached.key))
+}
+
+/// Photoshop shows the same flower at three resolutions. This example is original,
+/// vector-painted artwork, not an extracted Adobe asset, and it is independent of
+/// whichever layer happens to be selected (including adjustment layers).
+fn paint_flower_example(ui: &Ui, rect: egui::Rect) {
+    use egui::{Color32, Rect as UiRect, Shape, Stroke, pos2, vec2};
+    let painter = ui.painter().with_clip_rect(rect);
+    let side = rect.width();
+    let point = |x: f32, y: f32| pos2(rect.min.x + x * side, rect.min.y + y * side);
+    // A monochrome miniature landscape: light sky, shaded hills and a dark meadow.
+    for n in 0..22 {
+        let y0 = n as f32 / 22.0;
+        let y1 = (n + 1) as f32 / 22.0;
+        let f = n as f32 / 22.0;
+        painter.rect_filled(UiRect::from_min_max(point(0.0, y0), point(1.0, y1)), 0.0, Color32::from_gray((119.0 + f * 30.0) as u8));
+    }
+    painter.add(Shape::convex_polygon(
+        vec![point(0.0, 0.60), point(0.22, 0.36), point(0.46, 0.56), point(0.72, 0.33), point(1.0, 0.62)],
+        Color32::from_gray(80),
+        Stroke::NONE,
+    ));
+    painter.add(Shape::convex_polygon(
+        vec![point(0.0, 0.76), point(0.32, 0.60), point(0.57, 0.69), point(1.0, 0.51), point(1.0, 1.0), point(0.0, 1.0)],
+        Color32::from_gray(64),
+        Stroke::NONE,
+    ));
+    for n in 0..16 {
+        let x = ((n * 43 + 13) % 97) as f32 / 96.0;
+        let y = 0.78 + ((n * 11 % 19) as f32) / 100.0;
+        painter.line_segment([point(x, 1.0), point((x + 0.02).min(1.0), y)], Stroke::new(side * 0.01, Color32::from_gray(104)));
+    }
+    // A white daisy with layered petals and a dark central disc, in the same
+    // composition at all three sizes, so the controls genuinely preview scale.
+    let center = point(0.49, 0.57);
+    let unit = side * 0.34;
+    for n in 0..15 {
+        let theta = (n as f32 + 0.5) * std::f32::consts::TAU / 15.0;
+        let direction = vec2(theta.cos(), theta.sin());
+        let normal = vec2(-theta.sin(), theta.cos());
+        let mut outline = Vec::with_capacity(20);
+        for i in 0..=9 {
+            let t = i as f32 / 9.0;
+            let base = center + direction * unit * (0.22 + 0.83 * t);
+            outline.push(base + normal * (unit * 0.22 * (std::f32::consts::PI * t).sin()));
+        }
+        for i in (0..=9).rev() {
+            let t = i as f32 / 9.0;
+            let base = center + direction * unit * (0.22 + 0.83 * t);
+            outline.push(base - normal * (unit * 0.22 * (std::f32::consts::PI * t).sin()));
+        }
+        painter.add(Shape::convex_polygon(
+            outline,
+            if n % 3 == 0 { Color32::from_gray(213) } else { Color32::from_gray(238) },
+            Stroke::new(0.3, Color32::from_gray(155)),
+        ));
+    }
+    painter.circle_filled(center, unit * 0.27, Color32::from_gray(33));
+    painter.circle_filled(center - vec2(unit * 0.065, unit * 0.055), unit * 0.16, Color32::from_gray(55));
+    for n in 0..16 {
+        let theta = (n as f32) * std::f32::consts::TAU / 16.0;
+        let r = unit * if n % 2 == 0 { 0.16 } else { 0.21 };
+        painter.circle_filled(center + vec2(theta.cos(), theta.sin()) * r, (side * 0.008).max(0.3), Color32::from_gray(119));
+    }
+    painter.rect_stroke(rect, 0.0, Stroke::new(1.0, Color32::from_gray(92)), egui::StrokeKind::Inside);
+}
+
+/// Returns both the actual thumbnail width and the height allocated by the Layers
+/// row. Used by painting and by tests to keep the preference functional.
+pub(crate) fn thumbnail_geometry(size: LayerThumbnailSize, pro: bool) -> (f32, f32) {
+    let thumb: f32 = match size {
+        LayerThumbnailSize::None => 0.0,
+        LayerThumbnailSize::Small => 18.0,
+        LayerThumbnailSize::Medium => {
+            if pro {
+                24.0
+            } else {
+                34.0
+            }
+        }
+        LayerThumbnailSize::Large => 48.0,
+    };
+    let row = if thumb == 0.0 { 23.0 } else { (thumb + 8.0).max(if pro { 32.0 } else { 40.0 }) };
+    (thumb, row)
+}
+
+/// Content column of the Photoshop-style dialog, with fixed-size radio/preview
+/// slots rather than text labels that change the position of each thumbnail.
+fn options_body(ui: &mut Ui, draft: &mut LayersPanelOptions) {
+    ui.group(|ui| {
+        ui.set_min_width(308.0);
+        ui.label(egui::RichText::new(tl!("Thumbnail Size")).strong());
+        ui.add_space(7.0);
+        // The original Photoshop dialog has None with a label, then progressively
+        // larger previews, with the radio controls aligned vertically.
+        ui.horizontal(|ui| {
+            let r = ui.radio_value(&mut draft.thumbnail_size, LayerThumbnailSize::None, tl!("None"));
+            r.on_hover_text(tl!("None"));
+        });
+        ui.add_space(3.0);
+        for (size, side, name) in [
+            (LayerThumbnailSize::Small, 38.0, tl!("Small")),
+            (LayerThumbnailSize::Medium, 68.0, tl!("Medium")),
+            (LayerThumbnailSize::Large, 96.0, tl!("Large")),
+        ] {
+            ui.horizontal(|ui| {
+                // Empty radio captions are intentional: the sample itself conveys
+                // size. The accessible/hover label still names the setting.
+                let radio = ui.radio_value(&mut draft.thumbnail_size, size, "");
+                radio.on_hover_text(name);
+                ui.add_space(8.0);
+                let (rect, response) = ui.allocate_exact_size(egui::vec2(side, side), egui::Sense::click());
+                paint_flower_example(ui, rect);
+                if response.clicked() {
+                    draft.thumbnail_size = size;
+                }
+                response.on_hover_text(name);
+            });
+            ui.add_space(5.0);
+        }
+    });
+    ui.add_space(9.0);
+    ui.group(|ui| {
+        ui.set_min_width(308.0);
+        ui.label(egui::RichText::new(tl!("Thumbnail Contents")).strong());
+        ui.add_space(10.0);
+        ui.radio_value(&mut draft.thumbnail_contents, LayerThumbnailContents::LayerBounds, tl!("Layer Bounds"));
+        ui.add_space(4.0);
+        ui.radio_value(&mut draft.thumbnail_contents, LayerThumbnailContents::EntireDocument, tl!("Entire Document"));
+        ui.add_space(4.0);
+    });
+    ui.add_space(9.0);
+    ui.checkbox(&mut draft.expand_new_effects, tl!("Expand New Effects"));
+    ui.add_space(3.0);
+    ui.checkbox(&mut draft.add_copy_to_copied_layers_and_groups, tl!("Add “copy” to Copied Layers and Groups"));
+    ui.add_space(3.0);
+    ui.checkbox(&mut draft.preview_on_canvas_when_reordering_layers, tl!("Preview on canvas when reordering layers"));
+    ui.add_space(3.0);
+    ui.checkbox(&mut draft.show_layer_mask_badges, tl!("Show layer mask badges"));
+}
+
+/// Show the pending Layers panel dialog (Panel Options, New Layer, New Group, Lock Layers) as a modal and apply it on OK.
+pub fn show_dialog(app: &mut PhotocraftApp, ctx: &Context) {
+    let Some(mut dialog) = app.ui.layers_panel_dialog.take() else { return };
+    let mut confirmed = false;
+    let mut cancelled = ctx.input(|i| i.key_pressed(egui::Key::Escape));
+    let title = match &dialog {
+        LayersPanelDialog::PanelOptions(_) => tl!("Layers Panel Options"),
+        LayersPanelDialog::NewLayer(_) => tl!("New Layer"),
+        LayersPanelDialog::NewGroup(_) => tl!("New Group"),
+        LayersPanelDialog::LockLayers { .. } => tl!("Lock Layers"),
+    };
+    egui::Modal::new(egui::Id::new("layers-panel-options-modal")).show(ctx, |ui| {
+        ui.set_width(if matches!(dialog, LayersPanelDialog::PanelOptions(_)) { 480.0 } else { 380.0 });
+        ui.horizontal(|ui| {
+            ui.heading(title);
+            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                if ui.small_button("×").on_hover_text(tl!("Cancel")).clicked() {
+                    cancelled = true;
+                }
+            });
+        });
+        ui.separator();
+        match &mut dialog {
+            LayersPanelDialog::PanelOptions(opts) => {
+                ui.horizontal_top(|ui| {
+                    ui.vertical(|ui| {
+                        ui.set_width(345.0);
+                        ui.vertical(|ui| options_body(ui, opts));
+                    });
+                    ui.add_space(10.0);
+                    ui.vertical(|ui| {
+                        ui.set_min_width(74.0);
+                        if ui.add_sized([74.0, 29.0], egui::Button::new(tl!("OK"))).clicked() {
+                            confirmed = true;
+                        }
+                        ui.add_space(6.0);
+                        if ui.add_sized([74.0, 29.0], egui::Button::new(tl!("Cancel"))).clicked() {
+                            cancelled = true;
+                        }
+                    });
+                });
+            }
+            LayersPanelDialog::NewLayer(name) | LayersPanelDialog::NewGroup(name) => {
+                ui.label(tl!("Name:"));
+                ui.text_edit_singleline(name);
+            }
+            LayersPanelDialog::LockLayers { transparency, pixels, position, artboard, all } => {
+                ui.checkbox(transparency, tl!("Transparency"));
+                ui.checkbox(pixels, tl!("Image"));
+                ui.checkbox(position, tl!("Position"));
+                ui.checkbox(artboard, tl!("Prevent Auto-Nesting"));
+                ui.checkbox(all, tl!("All"));
+            }
+        }
+        if !matches!(dialog, LayersPanelDialog::PanelOptions(_)) {
+            ui.add_space(10.0);
+            ui.horizontal(|ui| {
+                if ui.button(tl!("OK")).clicked() {
+                    confirmed = true;
+                }
+                if ui.button(tl!("Cancel")).clicked() {
+                    cancelled = true;
+                }
+            });
+        }
+    });
+    if confirmed && !cancelled {
+        let r = match dialog {
+            LayersPanelDialog::PanelOptions(options) => apply_options(app, options),
+            LayersPanelDialog::NewLayer(name) => {
+                app.run("layer.new.layer", if name.trim().is_empty() { json!({}) } else { json!({"name": name.trim()}) }).map(|_| ())
+            }
+            LayersPanelDialog::NewGroup(name) => {
+                app.run("layer.new.group", if name.trim().is_empty() { json!({}) } else { json!({"name": name.trim()}) }).map(|_| ())
+            }
+            LayersPanelDialog::LockLayers { transparency, pixels, position, artboard, all } => app
+                .run("layer.lockLayers", json!({"transparency": transparency, "pixels": pixels, "position": position, "artboard": artboard, "all": all}))
+                .map(|_| ()),
+        };
+        if let Err(e) = r {
+            app.ui.status = e;
+            app.ui.status_error = true;
+        }
+    } else if !cancelled {
+        app.ui.layers_panel_dialog = Some(dialog);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// A fresh install shows Medium thumbnails of the whole document, like Photoshop's Panel Options defaults.
+    #[test]
+    fn default_panel_options_match_medium_document_previews() {
+        let options = LayersPanelOptions::default();
+        assert_eq!(options.thumbnail_size, LayerThumbnailSize::Medium);
+        assert_eq!(options.thumbnail_contents, LayerThumbnailContents::EntireDocument);
+        assert!(options.show_filters);
+        assert!(options.expand_new_effects);
+        assert!(options.add_copy_to_copied_layers_and_groups);
+        assert!(options.preview_on_canvas_when_reordering_layers);
+        assert!(!options.show_layer_mask_badges);
+    }
+
+    /// Thumbnail Contents is the same setting as the panel menu's Clip Thumbnails to Layer Bounds
+    /// (#4281): the dialog shows it and OK sets it, so the two never disagree.
+    #[test]
+    fn thumbnail_contents_is_clip_thumbnails_to_layer_bounds() {
+        let mut session = photocraft_engine::Session::new();
+        session.execute("file.new", json!({"width": 8, "height": 8})).unwrap();
+        let mut app = PhotocraftApp::new(session, crate::Services::default());
+        assert_eq!(thumbnail_contents(&app), LayerThumbnailContents::EntireDocument);
+        let mut options = app.ui.layers_panel_options.clone();
+        options.thumbnail_contents = LayerThumbnailContents::LayerBounds;
+        apply_options(&mut app, options.clone()).unwrap();
+        assert!(app.session.prefs().interface.clip_thumbnails_to_layer_bounds);
+        assert_eq!(thumbnail_contents(&app), LayerThumbnailContents::LayerBounds);
+        assert!(app.session.prefs().dialogs[OPTIONS_PREF].get("thumbnailContents").is_none(), "saved once, in the shared preference");
+        options.thumbnail_contents = LayerThumbnailContents::EntireDocument;
+        apply_options(&mut app, options).unwrap();
+        assert!(!app.session.prefs().interface.clip_thumbnails_to_layer_bounds);
+    }
+
+    /// The options survive a UiState round trip; an open dialog is view state and is never serialized.
+    #[test]
+    fn options_round_trip_without_a_pending_dialog() {
+        let mut ui = crate::state::UiState::default();
+        ui.layers_panel_options.thumbnail_size = LayerThumbnailSize::Large;
+        ui.layers_panel_options.show_filters = false;
+        ui.layers_panel_dialog = Some(LayersPanelDialog::NewGroup("test".into()));
+        let json = serde_json::to_value(&ui).unwrap();
+        assert!(json.get("layers_panel_dialog").is_none());
+        let restored: crate::state::UiState = serde_json::from_value(json).unwrap();
+        assert_eq!(restored.layers_panel_options, ui.layers_panel_options);
+        assert!(restored.layers_panel_dialog.is_none());
+    }
+
+    /// Every option, including the mask badges, goes to the preferences and comes back from them.
+    #[test]
+    fn prefs_options_save_and_restore_all_switches() {
+        let mut session = photocraft_engine::Session::new();
+        session.execute("file.new", json!({"width": 8, "height": 8})).unwrap();
+        let mut app = PhotocraftApp::new(session, crate::Services::default());
+        let saved = LayersPanelOptions {
+            thumbnail_size: LayerThumbnailSize::Large,
+            thumbnail_contents: LayerThumbnailContents::EntireDocument,
+            show_filters: false,
+            expand_new_effects: false,
+            add_copy_to_copied_layers_and_groups: false,
+            preview_on_canvas_when_reordering_layers: false,
+            show_layer_mask_badges: true,
+        };
+        app.ui.layers_panel_options = saved.clone();
+        persist_options(&mut app);
+        assert_eq!(app.session.prefs().dialogs[OPTIONS_PREF]["showLayerMaskBadges"], true);
+        app.ui.layers_panel_options = LayersPanelOptions::default();
+        restore_options(&mut app);
+        assert_eq!(app.ui.layers_panel_options, saved);
+    }
+
+    /// The flyout's Flatten Image runs the real `layer.flattenImage` command, and Undo brings the layers back.
+    #[test]
+    fn flyout_flatten_routes_to_real_engine_and_undo_restores_layers() {
+        let mut session = photocraft_engine::Session::new();
+        session.execute("file.new", json!({"width": 18, "height": 12})).unwrap();
+        session.execute("layer.new.layer", json!({"name": "Red pixels"})).unwrap();
+        session.execute("edit.fill", json!({"color": "#ff0000"})).unwrap();
+        let mut app = PhotocraftApp::new(session, crate::Services::default());
+        let count = app.session.active().unwrap().doc.layers.len();
+        assert!(count >= 2);
+        // The flyout uses menus::invoke with this exact command id.
+        crate::menus::invoke(&mut app, &egui::Context::default(), "layer.flattenImage", json!({})).unwrap();
+        let flattened = app.session.active().unwrap();
+        assert_eq!(flattened.doc.layers.len(), 1);
+        assert_eq!(flattened.doc.layers[0].name, "Background");
+        assert!(flattened.doc.layers[0].surface().is_some());
+        app.run("edit.undo", json!({})).unwrap();
+        assert_eq!(app.session.active().unwrap().doc.layers.len(), count);
+    }
+
+    /// Thumbnail and row sizes grow from None to Large in both themes, with the rows at least as tall as the thumbnails.
+    #[test]
+    fn geometry_matches_four_real_panel_sizes() {
+        for pro in [false, true] {
+            let mut previous = -1.0;
+            for size in [LayerThumbnailSize::None, LayerThumbnailSize::Small, LayerThumbnailSize::Medium, LayerThumbnailSize::Large] {
+                let (thumb, row) = thumbnail_geometry(size, pro);
+                assert!(thumb > previous && row >= thumb, "{size:?}: {thumb}/{row}");
+                previous = thumb;
+            }
+        }
+        assert_eq!(thumbnail_geometry(LayerThumbnailSize::None, true), (0.0, 23.0));
+        assert_eq!(thumbnail_geometry(LayerThumbnailSize::Large, true), (48.0, 56.0));
+    }
+
+    /// Preferences saved before an option existed still load, with the default for the missing ones.
+    #[test]
+    fn panel_options_missing_fields_deserialize_with_defaults() {
+        let options: LayersPanelOptions = serde_json::from_value(json!({})).unwrap();
+        assert_eq!(options, LayersPanelOptions::default());
+        let saved = serde_json::to_value(&options).unwrap();
+        assert_eq!(saved["thumbnailSize"], "medium");
+    }
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 8784800ddd..4d4dd6451c 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -126,6 +126,7 @@ pub mod layer_row_ui;
 pub mod layer_style;
 mod layer_transfer;
 pub mod layer_tree_ui;
+pub mod layers_panel_ui;
 mod layout_keys;
 pub mod links;
 pub mod liquify_ui;
@@ -672,6 +673,10 @@ pub struct PhotocraftApp {
     pub(crate) object_finder: Option<object_finder::Finder>,
     /// A blend mode hovered in the Layers panel, shown live (`blend_preview`).
     pub(crate) blend_preview: Option<blend_preview::BlendPreview>,
+    /// Layers panel drag: temporary reordered document displayed until mouse release.
+    pub(crate) reorder_preview: Option<layers_panel_ui::ReorderPreview>,
+    /// Whether the currently dragged layer is over a valid destination this frame.
+    pub(crate) reorder_preview_hit: bool,
     /// Patch Tool drag: the healed document at the pointer (`patch_preview`).
     pub(crate) patch_preview: Option<patch_preview::PatchPreview>,
     /// Content-Aware Move drag or box shown with its result (`cam_preview`).
@@ -945,6 +950,8 @@ impl PhotocraftApp {
             move_distance: None,
             object_finder: None,
             blend_preview: None,
+            reorder_preview: None,
+            reorder_preview_hit: false,
             patch_preview: None,
             cam_preview: None,
             magnetic: Default::default(),
@@ -1059,6 +1066,7 @@ impl PhotocraftApp {
         };
         // Saved preferences are in place before the first frame; recovery starts in upkeep.
         prefs_ui::load(&mut app);
+        layers_panel_ui::restore_options(&mut app);
         // After the saved preferences, which say whether the set was already offered.
         kys_import::offer_import(&mut app);
         notices::wayland_file_drop_guidance(&mut app);
@@ -2189,6 +2197,7 @@ impl eframe::App for PhotocraftApp {
         workspace_ui::windows(self, &ctx);
         palette::show(self, &ctx);
         dialogs::show(self, &ctx);
+        layers_panel_ui::show_dialog(self, &ctx);
         rasterize_prompt::run_pending(self, &ctx);
         jobs_ui::dialog(self, &ctx);
         discard_ui::show(self, &ctx);
diff --git a/crates/ui-egui/src/mask_thumbs_ui.rs b/crates/ui-egui/src/mask_thumbs_ui.rs
index 20f0b965d4..66534b6f86 100644
--- a/crates/ui-egui/src/mask_thumbs_ui.rs
+++ b/crates/ui-egui/src/mask_thumbs_ui.rs
@@ -150,6 +150,12 @@ pub fn paint(
                 painter.line_segment([k.right_top(), k.left_bottom()], st);
             }
         }
+        if app.ui.layers_panel_options.show_layer_mask_badges {
+            // Distinguish pixel and vector masks without altering their thumbnails.
+            let badge = Rect::from_min_size(pos2(r.right() - 9.0, r.bottom() - 9.0), vec2(9.0, 9.0));
+            painter.rect_filled(badge, 1.0, t.card);
+            crate::icons::paint(ui, badge, if kind == MaskKind::Vector { "pen-tool" } else { "circle-dot" }, 8.0, t.text);
+        }
         painter.rect_stroke(
             r,
             if t.pro { 0.0 } else { 4.0 },
@@ -166,6 +172,7 @@ pub fn paint(
 
 type Rects = (Vec<(MaskKind, Rect)>, Vec<(MaskKind, Rect)>);
 
+/// Memory key of the per-layer record of where the mask thumbnails and chains were drawn.
 fn rects_id() -> egui::Id {
     egui::Id::new("mask-thumb-rects")
 }
@@ -175,6 +182,12 @@ pub fn recorded(ctx: &egui::Context, id: u64) -> Option<Rects> {
     ctx.data(|d| d.get_temp::<std::collections::HashMap<u64, Rects>>(rects_id())).and_then(|m| m.get(&id).cloned())
 }
 
+/// Drop what was recorded for layer `id`, so a row drawn without mask thumbnails (thumbnail size
+/// None) can't be hit through rects from an earlier frame.
+pub fn forget(ctx: &egui::Context, id: u64) {
+    ctx.data_mut(|d| d.get_temp_mut_or_default::<std::collections::HashMap<u64, Rects>>(rects_id()).remove(&id));
+}
+
 /// A small vertical chain: two interlocking links.
 fn paint_chain(painter: &Painter, c: Pos2, color: Color32) {
     let st = Stroke::new(1.2, color);
diff --git a/crates/ui-egui/src/mask_thumbs_ui/tests.rs b/crates/ui-egui/src/mask_thumbs_ui/tests.rs
index 163c7cbae8..369e7468f5 100644
--- a/crates/ui-egui/src/mask_thumbs_ui/tests.rs
+++ b/crates/ui-egui/src/mask_thumbs_ui/tests.rs
@@ -214,6 +214,36 @@ fn dragging_a_layer_row_to_trash_still_deletes_the_layer_with_a_mask_targeted()
     assert!(h.state().session.active().unwrap().doc.layer(photocraft_doc::LayerId(masked)).is_none());
 }
 
+/// With the thumbnail size set to None no mask thumbnail is drawn, so a drag from where one used
+/// to be moves the layer (the row) rather than a mask that is no longer on screen.
+#[test]
+fn thumbnails_off_forget_the_mask_rects_and_drag_the_layer() {
+    let (s, masked, _) = session();
+    let mut h = harness(s, 0, 1.0, 290.0);
+    let stale = recorded(&h.ctx, masked).unwrap().0.into_iter().find(|(k, _)| *k == MaskKind::Pixel).unwrap().1;
+    click_with(&mut h, stale.center(), Modifiers::NONE);
+    h.state_mut().ui.layers_panel_options.thumbnail_size = crate::state::LayerThumbnailSize::None;
+    h.run_steps(3);
+    assert!(recorded(&h.ctx, masked).is_none(), "no mask thumbnails are recorded while they are off");
+
+    let row = crate::layer_row_ui::recorded(&h.ctx).into_iter().find(|r| r.layer == masked).unwrap().row;
+    let from = pos2(stale.center().x, row.center().y);
+    assert!(row.contains(from), "the old thumbnail position is still on the row");
+    let to = h.get_by_label("Delete Layer Mask").rect().center();
+    h.hover_at(from);
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: from, button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    h.run_steps(1);
+    for k in 1..=8 {
+        h.event(egui::Event::PointerMoved(from + (to - from) * (k as f32 / 8.0)));
+        h.run_steps(1);
+    }
+    h.event(egui::Event::PointerButton { pos: to, button: PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(3);
+    assert!(!h.state().ui.dialogs.iter().any(|d| crate::mask_trash_prompt::owns(&d.fields)), "no mask prompt: the mask was not dragged");
+    assert!(h.state().session.active().unwrap().doc.layer(photocraft_doc::LayerId(masked)).is_none(), "the layer went to the trash");
+}
+
 /// #3113: dragging the layer mask's thumbnail onto the Trash asks "Apply mask to layer before
 /// removing?" and keeps the layer; Apply applies the mask, Delete deletes it.
 #[test]
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 63b46f4429..ca687e1b0a 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -13,7 +13,7 @@ pub(crate) fn modal_allows(app: &PhotocraftApp, id: &str) -> bool {
     if app.camera_raw.is_some() || crate::crop_ui::blocks(app, id) {
         return false;
     }
-    (app.ui.dialogs.is_empty() && app.discard.is_none()) || crate::shortcuts::NAV_COMMANDS.contains(&id)
+    (app.ui.dialogs.is_empty() && app.ui.layers_panel_dialog.is_none() && app.discard.is_none()) || crate::shortcuts::NAV_COMMANDS.contains(&id)
 }
 
 /// Top-level menus in Photoshop order.
diff --git a/crates/ui-egui/src/panels.rs b/crates/ui-egui/src/panels.rs
index 1626eff450..33bf398b69 100644
--- a/crates/ui-egui/src/panels.rs
+++ b/crates/ui-egui/src/panels.rs
@@ -2471,7 +2471,11 @@ fn layers(app: &mut PhotocraftApp, ui: &mut egui::Ui) {
     let mut actions: Vec<(String, Value)> = Vec::new();
 
     let t = Tokens::get(ui.ctx());
-    if t.pro {
+    app.reorder_preview_hit = false;
+    if !ui.input(|i| i.pointer.primary_down()) || !app.ui.layers_panel_options.preview_on_canvas_when_reordering_layers {
+        app.reorder_preview = None;
+    }
+    if t.pro && app.ui.layers_panel_options.show_filters {
         crate::layer_filter_ui::bar(app, ui);
         ui.add_space(4.0);
     }
@@ -2672,6 +2676,11 @@ fn layers(app: &mut PhotocraftApp, ui: &mut egui::Ui) {
                 actions.push(done);
             }
         });
+    // Leaving the list or hovering an invalid target immediately cancels the temporary
+    // image. The release still uses the actual command, not the preview snapshot.
+    if !app.reorder_preview_hit {
+        app.reorder_preview = None;
+    }
     // A layer being dragged can also be dropped on the footer's Delete, New Layer and Group
     // buttons (#736); read the drag before it ends.
     let footer_drag = ctx.data(|d| d.get_temp::<u64>(egui::Id::new("layer-drag"))).map(|id| {
@@ -3015,9 +3024,13 @@ fn layer_row(
 ) -> Rect {
     let selected = row.selected;
     let t = Tokens::get(ctx);
-    // Photoshop's default (medium) thumbnails: 32 pt rows.
-    let row_h = if t.pro { 32.0 } else { 46.0 };
+    // The Layers Panel Options thumbnail size controls rows and both layer/mask thumbnails.
+    let (base, row_h) = crate::layers_panel_ui::thumbnail_geometry(app.ui.layers_panel_options.thumbnail_size, t.pro);
     let (rect, resp) = ui.allocate_exact_size(vec2(ui.available_width(), row_h), Sense::click_and_drag());
+    // With thumbnails off no mask thumbnail is drawn, so none may keep catching drags from older frames.
+    if base == 0.0 {
+        crate::mask_thumbs_ui::forget(ctx, l.id.0);
+    }
     // A drag from a mask's thumbnail drags that mask, not the layer (#3113, #3119).
     let mask_drag = starts_mask_drag(ctx, l, &resp);
     if let Some(kind) = mask_drag {
@@ -3096,8 +3109,8 @@ fn layer_row(
         + if l.is_group() { crate::layer_tree_ui::TRIANGLE_W } else { 0.0 }
         + if l.clipped { 12.0 } else { 0.0 }
         + crate::layer_row_ui::reserved_width(l);
-    let ts = crate::mask_thumbs_ui::thumb_size(l, if t.pro { 24.0 } else { 34.0 }, rect.width() - others);
-    let fixed = others + ts + 6.0 + crate::mask_thumbs_ui::width(l, ts);
+    let ts = if base == 0.0 { 0.0 } else { crate::mask_thumbs_ui::thumb_size(l, base, rect.width() - others) };
+    let fixed = others + if ts == 0.0 { 0.0 } else { ts + 6.0 + crate::mask_thumbs_ui::width(l, ts) };
     x += 28.0 + crate::layer_row_ui::indent(depth, rect.width(), fixed);
     let toggled = crate::layer_tree_ui::disclosure(ui, rect, &mut x, l, actions);
     if l.clipped {
@@ -3105,15 +3118,17 @@ fn layer_row(
         x += 12.0;
     }
     let thumb = Rect::from_min_size(pos2(x, rect.center().y - ts / 2.0), vec2(ts, ts));
-    draw_layer_thumb(app, ctx, ui, doc, l, thumb, row.primary);
-    x += ts + 6.0;
-    // Link chains and pixel / vector mask thumbnails (#153).
-    let masks = crate::mask_thumbs_ui::paint(app, ctx, ui, &painter, doc, l, &mut x, rect.center().y, ts, actions);
+    if ts > 0.0 {
+        draw_layer_thumb(app, ctx, ui, doc, l, thumb, row.primary);
+        x += ts + 6.0;
+    }
+    // With thumbnails disabled the labels and disclosure controls remain interactive.
+    let masks = if ts > 0.0 { crate::mask_thumbs_ui::paint(app, ctx, ui, &painter, doc, l, &mut x, rect.center().y, ts, actions) } else { Default::default() };
     let mask_rect = masks.thumb(crate::mask_thumbs_ui::MaskKind::Pixel);
     let vector_rect = masks.thumb(crate::mask_thumbs_ui::MaskKind::Vector);
     // Photoshop frames the targeted thumbnail (pixels, mask or vector mask) of the active layer
     // with corner brackets.
-    if row.primary {
+    if row.primary && ts > 0.0 {
         let target = if app.ui.vector_mask_target && vector_rect.is_some() {
             vector_rect
         } else if app.ui.mask_target {
@@ -3147,7 +3162,7 @@ fn layer_row(
     // Photoshop before 2026 set the Background layer's name in italics; 2026 sets it upright.
     let italic = !t.pro && doc.is_background(l.id);
     // Photoshop rows show only the name; the kind sub-label is a Studio-theme addition.
-    let is_pixel = t.pro || matches!(l.content, LayerContent::Raster(_));
+    let is_pixel = t.pro || ts == 0.0 || matches!(l.content, LayerContent::Raster(_));
     let name_rect = crate::layer_row_ui::truncated(&painter, &l.name, font, name_color, italic, name_right - x).map(|galley| {
         let text_pos = pos2(x, rect.center().y - galley.size().y / 2.0 - if is_pixel { 0.0 } else { 7.0 });
         let r = Rect::from_min_size(text_pos, galley.size());
@@ -3162,7 +3177,10 @@ fn layer_row(
         };
         crate::layer_row_ui::label(&painter, x, rect.center().y + 8.0, name_right, &sub, egui::FontId::proportional(11.0), t.text_faint);
     }
-    crate::layer_row_ui::record(ctx, crate::layer_row_ui::RowRects { layer: l.id.0, row: rect, name: name_rect, indicators });
+    crate::layer_row_ui::record(
+        ctx,
+        crate::layer_row_ui::RowRects { layer: l.id.0, row: rect, thumbnail: (ts > 0.0).then_some(thumb), name: name_rect, indicators },
+    );
     // ⌘-click a layer, mask or vector-mask thumbnail loads its transparency / mask / path as a
     // selection (⇧ add, ⌥ subtract, ⇧⌥ intersect) instead of changing the layer selection.
     let thumb_load = resp.clicked().then(|| (ui.input(|i| i.modifiers), resp.interact_pointer_pos())).and_then(|(m, pos)| {
@@ -3171,7 +3189,7 @@ fn layer_row(
             return Some(crate::mask_thumbs_ui::load_params(l, kind, m));
         }
         // The Background has no transparency to load: Photoshop treats the click as a plain one.
-        (!doc.is_background(l.id) && thumb.expand(2.0).contains(p))
+        (ts > 0.0 && !doc.is_background(l.id) && thumb.expand(2.0).contains(p))
             .then(|| json!({"channel": "transparency", "layer": l.id.0, "operation": crate::channels_panel::load_operation(m)}))
     });
     // ⇧-click a mask thumbnail: disable / enable that mask; ⌥-click a layer mask: view it.
@@ -3186,7 +3204,7 @@ fn layer_row(
     } else if resp.clicked() && !eye_resp.clicked() && !toggled && !fx_toggled && !masks.clicked {
         let m = ui.input(|i| i.modifiers);
         let pos = resp.interact_pointer_pos();
-        let on_thumb = pos.is_some_and(|p| thumb.expand(2.0).contains(p));
+        let on_thumb = ts > 0.0 && pos.is_some_and(|p| thumb.expand(2.0).contains(p));
         // ⌘-click on the Background thumbnail stands in for the plain click (there is no
         // transparency to load): it selects the Background alone, not toggled into the set.
         let mode = if m.command && on_thumb && doc.is_background(l.id) { "replace" } else { select_mode(m) };
@@ -3251,9 +3269,9 @@ fn layer_row(
             }
         } else if pos.and_then(|p| masks.hit(p)).is_none() {
             let id = match &l.content {
-                LayerContent::Adjustment(_) | LayerContent::Fill(_) | LayerContent::Shape(_) if on(thumb) => "layer.layerContentOptions",
-                LayerContent::Smart(_) if on(thumb) => "layer.smartObjects.editContents",
-                LayerContent::Text(_) if on(thumb) => "type.editText",
+                LayerContent::Adjustment(_) | LayerContent::Fill(_) | LayerContent::Shape(_) if ts > 0.0 && on(thumb) => "layer.layerContentOptions",
+                LayerContent::Smart(_) if ts > 0.0 && on(thumb) => "layer.smartObjects.editContents",
+                LayerContent::Text(_) if ts > 0.0 && on(thumb) => "type.editText",
                 _ => "layer.layerStyle.blendingOptions",
             };
             if crate::menus::is_enabled(app, id) {
@@ -4276,7 +4294,7 @@ fn background_drop_refused(doc: &photocraft_doc::Document, payload: &Value, targ
 /// release the layers stay put and copies land there instead (Photoshop).
 /// Multi-layer moves are atomic (one undo step), using the engine's stable document order.
 fn layer_drag_and_drop(
-    app: &PhotocraftApp,
+    app: &mut PhotocraftApp,
     ctx: &egui::Context,
     ui: &egui::Ui,
     l: &Layer,
@@ -4320,12 +4338,15 @@ fn layer_drag_and_drop(
             } else {
                 painter.line_segment([rect.left_bottom(), rect.right_bottom()], Stroke::new(2.0, t.accent));
             }
+            let mut payload = layer_drop_payload(dragged, l.id, position, &selected);
+            if let Some(o) = payload.as_object_mut() {
+                o.insert("copy".into(), json!(true));
+            }
             if released {
-                let mut payload = layer_drop_payload(dragged, l.id, position, &selected);
-                if let Some(o) = payload.as_object_mut() {
-                    o.insert("copy".into(), json!(true));
-                }
+                app.reorder_preview = None;
                 actions.push(("layer.moveTo".into(), payload));
+            } else if ctx.input(|i| i.pointer.primary_down()) {
+                crate::layers_panel_ui::preview_reorder(app, &payload);
             }
         }
         return;
@@ -4359,10 +4380,14 @@ fn layer_drag_and_drop(
             painter.line_segment([rect.left_bottom(), rect.right_bottom()], Stroke::new(2.0, t.accent));
         }
     }
+    if copy && let Some(o) = payload.as_object_mut() {
+        o.insert("copy".into(), json!(true));
+    }
+    if !released && ctx.input(|i| i.pointer.primary_down()) {
+        crate::layers_panel_ui::preview_reorder(app, &payload);
+    }
     if released {
-        if copy && let Some(o) = payload.as_object_mut() {
-            o.insert("copy".into(), json!(true));
-        }
+        app.reorder_preview = None;
         actions.push(("layer.moveTo".into(), payload));
     }
 }
@@ -4372,7 +4397,7 @@ fn layer_drag_and_drop(
 /// with ⌥ held on release (Photoshop), a move without. A multi-selection dropped on the row it
 /// was grabbed from is left alone: the engine can only copy it beside each of its own layers.
 fn layer_drop_zone(
-    app: &PhotocraftApp,
+    app: &mut PhotocraftApp,
     ctx: &egui::Context,
     ui: &egui::Ui,
     zone: Rect,
@@ -4392,14 +4417,17 @@ fn layer_drop_zone(
     let t = Tokens::get(ctx);
     let line = if position == "above" { [target.1.left_top(), target.1.right_top()] } else { [target.1.left_bottom(), target.1.right_bottom()] };
     ui.painter().line_segment(line, Stroke::new(2.0, t.accent));
+    let mut payload = layer_drop_payload(dragged, target.0, position, &selected);
+    if ctx.input(|i| i.modifiers.alt)
+        && let Some(o) = payload.as_object_mut()
+    {
+        o.insert("copy".into(), json!(true));
+    }
     if ctx.input(|i| i.pointer.any_released()) {
-        let mut payload = layer_drop_payload(dragged, target.0, position, &selected);
-        if ctx.input(|i| i.modifiers.alt)
-            && let Some(o) = payload.as_object_mut()
-        {
-            o.insert("copy".into(), json!(true));
-        }
+        app.reorder_preview = None;
         actions.push(("layer.moveTo".into(), payload));
+    } else if ctx.input(|i| i.pointer.primary_down()) {
+        crate::layers_panel_ui::preview_reorder(app, &payload);
     }
 }
 
diff --git a/crates/ui-egui/src/state.rs b/crates/ui-egui/src/state.rs
index 974d3fde35..d79abfd816 100644
--- a/crates/ui-egui/src/state.rs
+++ b/crates/ui-egui/src/state.rs
@@ -3,6 +3,72 @@
 
 use serde::{Deserialize, Serialize};
 
+/// Photoshop-style Layers panel display preferences; part of serialized UI state.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub enum LayerThumbnailSize {
+    None,
+    Small,
+    #[default]
+    Medium,
+    Large,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub enum LayerThumbnailContents {
+    LayerBounds,
+    #[default]
+    EntireDocument,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(default, rename_all = "camelCase")]
+pub struct LayersPanelOptions {
+    pub thumbnail_size: LayerThumbnailSize,
+    /// Thumbnail Contents in the Panel Options dialog. Not saved with these options: the dialog
+    /// shows and sets `interface.clipThumbnailsToLayerBounds` (Layer Bounds = clipped, #4281),
+    /// which the panel menu's Clip Thumbnails to Layer Bounds toggles too.
+    #[serde(skip)]
+    pub thumbnail_contents: LayerThumbnailContents,
+    pub show_filters: bool,
+    pub expand_new_effects: bool,
+    pub add_copy_to_copied_layers_and_groups: bool,
+    pub preview_on_canvas_when_reordering_layers: bool,
+    pub show_layer_mask_badges: bool,
+}
+
+impl LayersPanelOptions {
+    /// Every option at the Photoshop default: Medium thumbnails, filters shown, new effects expanded, no mask badges.
+    pub fn defaults() -> Self {
+        Self {
+            thumbnail_size: LayerThumbnailSize::Medium,
+            thumbnail_contents: LayerThumbnailContents::EntireDocument,
+            show_filters: true,
+            expand_new_effects: true,
+            add_copy_to_copied_layers_and_groups: true,
+            preview_on_canvas_when_reordering_layers: true,
+            show_layer_mask_badges: false,
+        }
+    }
+}
+
+impl Default for LayersPanelOptions {
+    /// Same as [`LayersPanelOptions::defaults`], so serde fills missing fields with the Photoshop defaults.
+    fn default() -> Self {
+        Self::defaults()
+    }
+}
+
+/// Pending dialog data is transient: Cancel never changes persisted options.
+#[derive(Clone, Debug, PartialEq)]
+pub enum LayersPanelDialog {
+    PanelOptions(LayersPanelOptions),
+    NewLayer(String),
+    NewGroup(String),
+    LockLayers { transparency: bool, pixels: bool, position: bool, artboard: bool, all: bool },
+}
+
 /// Shared selection and capture for a point curve; document parameters remain with the host.
 #[derive(Clone, Copy, Debug, Default, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase", default)]
@@ -1219,6 +1285,12 @@ pub struct UiState {
     /// Layers panel kind filter ("pixel", "adjustment", "type", "shape", "smart"); empty = all.
     #[serde(default)]
     pub layer_filter: Vec<String>,
+    /// Thumbnail dimensions, content cropping and filter-strip visibility.
+    #[serde(default)]
+    pub layers_panel_options: LayersPanelOptions,
+    /// Transient dialog; never restored with a workspace.
+    #[serde(skip)]
+    pub layers_panel_dialog: Option<LayersPanelDialog>,
     /// Layers panel filter type (#5048): kind (above), name or blend mode.
     #[serde(default)]
     pub layer_filter_by: crate::layer_filter_ui::FilterBy,
@@ -1398,6 +1470,8 @@ impl Default for UiState {
             artboard_tool: Default::default(),
             shell: Default::default(),
             layer_filter: Vec::new(),
+            layers_panel_options: LayersPanelOptions::default(),
+            layers_panel_dialog: None,
             layer_filter_by: Default::default(),
             layer_filter_name: String::new(),
             layer_filter_mode: default_layer_filter_mode(),