diff --git a/crates/engine/src/cmd.rs b/crates/engine/src/cmd.rs
index 411f2004a..6b658da0d 100644
--- a/crates/engine/src/cmd.rs
+++ b/crates/engine/src/cmd.rs
@@ -179,6 +179,21 @@ pub fn has_multi(s: &Session) -> std::result::Result<(), String> {
     let st = s.active().ok_or("no document open")?;
     if st.selection.len() < 2 { Err("select at least two objects".into()) } else { Ok(()) }
 }
+/// A document is open and it is not in isolation mode: Object › Lock's and Object › Hide's items,
+/// Unlock All and Show All are off in isolation mode. Pattern editing mode and opacity mask
+/// editing isolate their art too, and do not count as isolation mode here while their own layer
+/// is the isolated one. An object isolated inside them counts.
+pub fn outside_isolation(s: &Session) -> std::result::Result<(), String> {
+    let st = s.active().ok_or("no document open")?;
+    let editing_layer = |l| st.doc.pattern_edit.as_ref().is_some_and(|e| e.layer == l) || st.doc.mask_edit.as_ref().is_some_and(|e| e.layer == l);
+    if st.isolation.is_some_and(|l| !editing_layer(l)) { Err("exit isolation mode first".into()) } else { Ok(()) }
+}
+/// Objects are selected ([`has_selection`]) and the document is not in isolation mode
+/// ([`outside_isolation`]).
+pub fn has_selection_outside_isolation(s: &Session) -> std::result::Result<(), String> {
+    outside_isolation(s)?;
+    has_selection(s)
+}
 pub fn can_undo(s: &Session) -> std::result::Result<(), String> {
     s.active().filter(|d| !d.history.undo.is_empty()).map(|_| ()).ok_or_else(|| "nothing to undo".into())
 }
diff --git a/crates/engine/src/cmd/menucmds.rs b/crates/engine/src/cmd/menucmds.rs
index 6d8f9fd40..e4e02128c 100644
--- a/crates/engine/src/cmd/menucmds.rs
+++ b/crates/engine/src/cmd/menucmds.rs
@@ -16,7 +16,7 @@ use vectorcraft_render::encode::{RasterExportOptions, RasterFormat};
 use super::edit::{duplicate_in, selected_roots};
 use super::{
     CommandSpec, EngineError, Result, Session, bad, check_numbers, check_switches, cmd, f64_or, fileio, find_command, has_doc, has_selection,
-    switch_or,
+    has_selection_outside_isolation, switch_or,
 };
 
 /// Session-level (not saved) state owned by the menu commands.
@@ -44,7 +44,7 @@ pub fn specs() -> Vec<CommandSpec> {
             ["Object", "Lock"],
             None,
             "{} lock objects in the same layer that are above and overlap the selection, deselecting every selected object left locked or hidden (the key object too) → {count}",
-            has_selection,
+            has_selection_outside_isolation,
             |s, _| above(s, true)
         ),
         cmd!(
@@ -53,7 +53,7 @@ pub fn specs() -> Vec<CommandSpec> {
             ["Object", "Lock"],
             None,
             "{} lock every layer that holds no selected object → {count}",
-            has_selection,
+            has_selection_outside_isolation,
             |s, _| other_layers(s, true)
         ),
         cmd!(
@@ -62,7 +62,7 @@ pub fn specs() -> Vec<CommandSpec> {
             ["Object", "Hide"],
             None,
             "{} hide objects in the same layer that are above and overlap the selection, deselecting every selected object left hidden or locked (the key object too) → {count}",
-            has_selection,
+            has_selection_outside_isolation,
             |s, _| above(s, false)
         ),
         cmd!(
@@ -71,7 +71,7 @@ pub fn specs() -> Vec<CommandSpec> {
             ["Object", "Hide"],
             None,
             "{} hide every layer that holds no selected object → {count}",
-            has_selection,
+            has_selection_outside_isolation,
             |s, _| other_layers(s, false)
         ),
         cmd!(
diff --git a/crates/engine/src/cmd/object/commands.rs b/crates/engine/src/cmd/object/commands.rs
index 4bf072749..5cf7fbe8e 100644
--- a/crates/engine/src/cmd/object/commands.rs
+++ b/crates/engine/src/cmd/object/commands.rs
@@ -6,6 +6,7 @@ use super::props::set_props;
 use super::shape::{expand_shape, set_live_shape};
 use super::transform::{move_cmd, nudge, reflect, rotate, scale, shear, transform, transform_again};
 use super::{CommandSpec, cmd, has_doc, has_multi, has_selection, has_selection_or_guides};
+use crate::cmd::{has_selection_outside_isolation, outside_isolation};
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![
@@ -150,20 +151,20 @@ pub fn specs() -> Vec<CommandSpec> {
             ["Object", "Lock"],
             Some("Cmd+2"),
             "{ids?: [id…] (selected first; default: the selection)}",
-            has_selection,
+            has_selection_outside_isolation,
             lock
         ),
-        cmd!("object.unlockAll", "Unlock All", ["Object"], Some("Cmd+Alt+2"), "{}", has_doc, unlock_all),
+        cmd!("object.unlockAll", "Unlock All", ["Object"], Some("Cmd+Alt+2"), "{}", outside_isolation, unlock_all),
         cmd!(
             "object.hide",
             "Selection",
             ["Object", "Hide"],
             Some("Cmd+3"),
             "{ids?: [id…] (selected first; default: the selection)}",
-            has_selection,
+            has_selection_outside_isolation,
             hide
         ),
-        cmd!("object.showAll", "Show All", ["Object"], Some("Cmd+Alt+3"), "{}", has_doc, show_all),
+        cmd!("object.showAll", "Show All", ["Object"], Some("Cmd+Alt+3"), "{}", outside_isolation, show_all),
         cmd!(
             "object.compoundPath.make",
             "Make",
diff --git a/crates/engine/src/tests/menucmds.rs b/crates/engine/src/tests/menucmds.rs
index c02314b96..5c227c8aa 100644
--- a/crates/engine/src/tests/menucmds.rs
+++ b/crates/engine/src/tests/menucmds.rs
@@ -286,6 +286,145 @@ fn lock_and_hide_other_layers() {
     assert!(!s.doc().unwrap().doc.node(l2).unwrap().visible);
 }
 
+/// Whether `id` is visible and whether it is locked.
+fn shown_and_locked(s: &Session, id: NodeId) -> (bool, bool) {
+    let n = node(s, id);
+    (n.visible, n.locked)
+}
+
+/// Each of `commands` is off in isolation mode: the command list reports it disabled, its error
+/// names isolation mode, and so does the error of a call that gives the selection as `ids` (for a
+/// command that takes them).
+fn off_in_isolation(s: &mut Session, commands: &[&str]) {
+    let ids: Vec<u64> = selected(s).iter().map(|i| i.0).collect();
+    for c in commands {
+        let spec = find_command(c).unwrap();
+        assert_eq!(spec.info(s).disabled_reason.as_deref(), Some("exit isolation mode first"), "{c}");
+        let given = cmd::params::takes_key(spec.params, "ids").then(|| json!({"ids": ids}));
+        for p in std::iter::once(json!({})).chain(given) {
+            let e = s.execute(c, &p).unwrap_err().to_string();
+            assert!(e.contains("exit isolation mode first"), "{c} {p}: {e}");
+        }
+    }
+}
+
+/// In isolation mode, Lock › Selection and Hide › Selection are off and change nothing, in an
+/// isolated group and in an isolated compound path with one of its paths selected. After Exit
+/// Isolation Mode they lock and hide again.
+#[test]
+fn lock_and_hide_selection_are_off_in_isolation_mode() {
+    let mut s = session();
+    let a = rect(&mut s, 0.0, 0.0, 10.0, 10.0);
+    let b = rect(&mut s, 20.0, 0.0, 10.0, 10.0);
+    sel(&mut s, &[a, b]);
+    let g = id_of(&s.execute("object.group", &json!({})).unwrap());
+    let outer = rect(&mut s, 100.0, 100.0, 100.0, 100.0);
+    let hole = rect(&mut s, 120.0, 120.0, 20.0, 20.0);
+    sel(&mut s, &[outer, hole]);
+    let compound = id_of(&s.execute("object.compoundPath.make", &json!({})).unwrap());
+    let ids = [a, b, g, outer, hole, compound];
+    let commands = ["object.lock", "object.hide"];
+    for (isolated, member) in [(g, a), (compound, hole)] {
+        s.execute("object.isolate", &json!({"id": isolated.0})).unwrap();
+        sel(&mut s, &[member]);
+        off_in_isolation(&mut s, &commands);
+        for id in ids {
+            assert_eq!(shown_and_locked(&s, id), (true, false), "{id:?} in isolation of {isolated:?}");
+        }
+        assert_eq!(selected(&s), [member]);
+        s.execute("object.exitIsolation", &json!({})).unwrap();
+    }
+    sel(&mut s, &[a]);
+    s.execute("object.lock", &json!({})).unwrap();
+    sel(&mut s, &[outer]);
+    s.execute("object.hide", &json!({})).unwrap();
+    assert_eq!(shown_and_locked(&s, a), (true, true));
+    assert_eq!(shown_and_locked(&s, compound), (false, false));
+}
+
+/// In isolation mode, Unlock All and Show All are off: the locked and the hidden objects outside
+/// and inside the isolated group stay as they are. Pattern editing mode and opacity mask editing
+/// are not isolation mode for them.
+#[test]
+fn unlock_all_and_show_all_are_off_in_isolation_mode() {
+    let mut s = session();
+    let a = rect(&mut s, 0.0, 0.0, 10.0, 10.0);
+    let b = rect(&mut s, 20.0, 0.0, 10.0, 10.0);
+    let c = rect(&mut s, 40.0, 0.0, 10.0, 10.0);
+    sel(&mut s, &[a, b, c]);
+    let g = id_of(&s.execute("object.group", &json!({})).unwrap());
+    let locked = rect(&mut s, 100.0, 0.0, 10.0, 10.0);
+    let hidden = rect(&mut s, 120.0, 0.0, 10.0, 10.0);
+    s.execute("layer.setProps", &json!({"id": locked.0, "locked": true})).unwrap();
+    s.execute("layer.setProps", &json!({"id": hidden.0, "visible": false})).unwrap();
+    s.execute("layer.setProps", &json!({"id": b.0, "locked": true})).unwrap();
+    s.execute("layer.setProps", &json!({"id": c.0, "visible": false})).unwrap();
+    s.execute("object.isolate", &json!({"id": g.0})).unwrap();
+    sel(&mut s, &[a]);
+    off_in_isolation(&mut s, &["object.unlockAll", "object.showAll"]);
+    for (id, want) in [(locked, (true, true)), (hidden, (false, false)), (b, (true, true)), (c, (false, false))] {
+        assert_eq!(shown_and_locked(&s, id), want, "{id:?}");
+    }
+    s.execute("object.exitIsolation", &json!({})).unwrap();
+    s.execute("object.unlockAll", &json!({})).unwrap();
+    s.execute("object.showAll", &json!({})).unwrap();
+    for id in [locked, hidden, b, c] {
+        assert_eq!(shown_and_locked(&s, id), (true, false), "{id:?}");
+    }
+
+    // Pattern editing mode: the tile's art hides and shows again.
+    let r = rect(&mut s, 300.0, 300.0, 10.0, 10.0);
+    sel(&mut s, &[r]);
+    s.execute("object.pattern.make", &json!({"name": "P"})).unwrap();
+    let tile = selected(&s);
+    s.execute("object.hide", &json!({})).unwrap();
+    assert!(!node(&s, tile[0]).visible, "hidden in pattern editing mode");
+    s.execute("object.showAll", &json!({})).unwrap();
+    assert!(node(&s, tile[0]).visible, "shown in pattern editing mode");
+    // An object isolated inside pattern editing mode is isolation mode again.
+    s.execute("object.isolate", &json!({"id": tile[0].0})).unwrap();
+    sel(&mut s, &[tile[0]]);
+    off_in_isolation(&mut s, &["object.unlockAll", "object.showAll"]);
+    s.execute("object.pattern.cancel", &json!({})).unwrap();
+
+    // Opacity mask editing: the mask's art locks and unlocks again.
+    let obj = rect(&mut s, 0.0, 300.0, 200.0, 200.0);
+    let m = rect(&mut s, 0.0, 300.0, 100.0, 200.0);
+    sel(&mut s, &[obj, m]);
+    s.execute("transparency.makeOpacityMask", &json!({})).unwrap();
+    s.execute("transparency.editOpacityMask", &json!({})).unwrap();
+    let mask = selected(&s);
+    s.execute("object.lock", &json!({})).unwrap();
+    assert!(node(&s, mask[0]).locked, "locked in opacity mask editing");
+    s.execute("object.unlockAll", &json!({})).unwrap();
+    assert!(!node(&s, mask[0]).locked, "unlocked in opacity mask editing");
+}
+
+/// In isolation mode, Lock › All Artwork Above, Lock › Other Layers, Hide › All Artwork Above and
+/// Hide › Other Layers are off: the art above and the other layer stay as they are.
+#[test]
+fn lock_and_hide_above_and_other_layers_are_off_in_isolation_mode() {
+    let mut s = session();
+    let a = rect(&mut s, 0.0, 0.0, 100.0, 100.0);
+    let b = rect(&mut s, 200.0, 0.0, 10.0, 10.0);
+    sel(&mut s, &[a, b]);
+    let g = id_of(&s.execute("object.group", &json!({})).unwrap());
+    let over = rect(&mut s, 50.0, 50.0, 100.0, 100.0);
+    let l2 = id_of(&s.execute("layer.new", &json!({})).unwrap());
+    s.execute("object.isolate", &json!({"id": g.0})).unwrap();
+    sel(&mut s, &[a]);
+    off_in_isolation(&mut s, &["object.lock.above", "object.lock.otherLayers", "object.hide.above", "object.hide.otherLayers"]);
+    for id in [a, b, g, over, l2] {
+        assert_eq!(shown_and_locked(&s, id), (true, false), "{id:?}");
+    }
+    s.execute("object.exitIsolation", &json!({})).unwrap();
+    sel(&mut s, &[g]);
+    assert_eq!(s.execute("object.lock.above", &json!({})).unwrap(), json!({"count": 1}));
+    s.execute("object.hide.otherLayers", &json!({})).unwrap();
+    assert_eq!(shown_and_locked(&s, over), (true, true));
+    assert_eq!(shown_and_locked(&s, l2), (false, false));
+}
+
 /// How many steps there are to undo and to redo, and whether the document has unsaved changes.
 fn history(s: &Session) -> (usize, usize, bool) {
     let st = s.doc().unwrap();
diff --git a/crates/ui-egui/src/canvas/task_bar.rs b/crates/ui-egui/src/canvas/task_bar.rs
index d7cc1c4df..a81d8307f 100644
--- a/crates/ui-egui/src/canvas/task_bar.rs
+++ b/crates/ui-egui/src/canvas/task_bar.rs
@@ -225,7 +225,9 @@ pub(super) fn task_bar(app: &mut VectorcraftApp, ui: &mut Ui, xf: &Xf) {
                         if colored && widgets::icon_button(ui, "palette", tl!("Recolor Artwork"), false, 30.0).clicked() {
                             run = Some(("ui.recolorDialog", json!({})));
                         }
-                        if widgets::icon_button(ui, "lock", tl!("Lock (⌘2)"), false, 30.0).clicked() {
+                        // The Lock button is off in isolation mode, as Object › Lock › Selection is.
+                        let lockable = crate::menus::enabled(app, "object.lock");
+                        if widgets::icon_button_enabled(ui, "lock", tl!("Lock (⌘2)"), false, lockable, 30.0).clicked() {
                             run = Some(("object.lock", json!({})));
                         }
                     }
diff --git a/crates/ui-egui/src/canvas/tests.rs b/crates/ui-egui/src/canvas/tests.rs
index 55a1341ab..bb76684dc 100644
--- a/crates/ui-egui/src/canvas/tests.rs
+++ b/crates/ui-egui/src/canvas/tests.rs
@@ -6102,6 +6102,43 @@ fn the_task_bar_recolors_coloured_art() {
     assert!(app.ui.dialog.is_none(), "no Recolor button without colours");
 }
 
+/// The Contextual Task Bar's Lock button is off in isolation mode, as Object › Lock › Selection
+/// is: a click locks nothing and shows no error. Outside isolation mode it locks the selection.
+#[test]
+fn the_task_bar_lock_button_is_off_in_isolation_mode() {
+    let mut app = VectorcraftApp::new(Session::new(), Default::default());
+    app.session.execute("file.new", &json!({"width": 400, "height": 300})).unwrap();
+    let a = app.session.execute("shape.rectangle", &json!({"x": 150, "y": 130, "width": 40, "height": 40})).unwrap()["id"].clone();
+    let b = app.session.execute("shape.rectangle", &json!({"x": 210, "y": 130, "width": 40, "height": 40})).unwrap()["id"].clone();
+    app.session.execute("select.set", &json!({"ids": [a.clone(), b]})).unwrap();
+    let g = app.session.execute("object.group", &json!({})).unwrap()["id"].clone();
+    app.select_tool("selection");
+    let ctx = egui::Context::default();
+    let click_lock = |app: &mut VectorcraftApp| {
+        frame(app, &ctx, vec![]);
+        frame(app, &ctx, vec![]);
+        let bar = task_bar_rect(&ctx).expect("the task bar shows");
+        // Right to left: the frame's margin, More Options, then Lock.
+        let at = pos2(bar.right() - 8.0 - 30.0 - 6.0 - 15.0, bar.center().y);
+        let button = |pressed| egui::Event::PointerButton { pos: at, button: egui::PointerButton::Primary, pressed, modifiers: Default::default() };
+        frame(app, &ctx, vec![egui::Event::PointerMoved(at)]);
+        frame(app, &ctx, vec![button(true)]);
+        frame(app, &ctx, vec![button(false)]);
+    };
+    let locked = |app: &VectorcraftApp, id: &serde_json::Value| {
+        app.session.active().unwrap().doc.node(vectorcraft_doc::NodeId(id.as_u64().unwrap())).unwrap().locked
+    };
+    app.session.execute("object.isolate", &json!({"id": g.clone()})).unwrap();
+    app.session.execute("select.set", &json!({"ids": [a.clone()]})).unwrap();
+    click_lock(&mut app);
+    assert!(!locked(&app, &a), "nothing is locked in isolation mode");
+    assert_eq!(app.ui.status, "", "no error");
+    app.session.execute("object.exitIsolation", &json!({})).unwrap();
+    app.session.execute("select.set", &json!({"ids": [g.clone()]})).unwrap();
+    click_lock(&mut app);
+    assert!(locked(&app, &g), "the group is locked outside isolation mode");
+}
+
 /// The Contextual Task Bar shows Image Trace first for a selected image: it traces the image
 /// with the Default preset and leaves the Image Trace panel as it was. For the Image Trace
 /// object it made, the first button is Expand, which keeps only the traced paths.
diff --git a/crates/ui-egui/src/i18n/bg.tsv b/crates/ui-egui/src/i18n/bg.tsv
index 8041aa9a3..973bc63e3 100644
--- a/crates/ui-egui/src/i18n/bg.tsv
+++ b/crates/ui-egui/src/i18n/bg.tsv
@@ -4155,6 +4155,7 @@ axis	Both	И двете
 @msg	select an object in perspective	изберете обект в перспектива
 @msg	select artwork (or a colour group) to recolor	изберете графика (или цветова група) за преоцветяване
 @msg	select at least two objects	изберете поне два обекта
+@msg	exit isolation mode first	първо излезте от режима на изолация
 @msg	select objects, not layers	изберете обекти, а не слоеве
 @msg	select one path, or give its `id`	изберете един път или задайте неговия `id`
 @msg	select paths to join	изберете пътища за обединяване
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index 3d354adcf..2375fca0f 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -4561,6 +4561,7 @@ imageTrace	Outline	Obrys
 @msg	select an object in perspective	vyberte objekt v perspektivě
 @msg	select artwork (or a colour group) to recolor	vyberte kresbu (nebo skupinu barev) k přebarvení
 @msg	select at least two objects	vyberte alespoň dva objekty
+@msg	exit isolation mode first	nejprve ukončete izolovaný režim
 @msg	select objects, not layers	vyberte objekty, ne vrstvy
 @msg	select one path, or give its `id`	vyberte jednu cestu, nebo zadejte její `id`
 @msg	select paths to join	vyberte cesty ke spojení
diff --git a/crates/ui-egui/src/i18n/da.tsv b/crates/ui-egui/src/i18n/da.tsv
index 3816a2b89..4ad040f26 100644
--- a/crates/ui-egui/src/i18n/da.tsv
+++ b/crates/ui-egui/src/i18n/da.tsv
@@ -4258,6 +4258,7 @@ imageTrace	Outline	Kontur
 @msg	select an object in perspective	markér et objekt i perspektiv
 @msg	select artwork (or a colour group) to recolor	markér grafik (eller en farvegruppe) for at skifte farver
 @msg	select at least two objects	markér mindst to objekter
+@msg	exit isolation mode first	afslut først isoleringstilstand
 @msg	select objects, not layers	markér objekter, ikke lag
 @msg	select one path, or give its `id`	markér én sti, eller angiv dens `id`
 @msg	select paths to join	markér stier, der skal forbindes
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index c0dc4648f..6ab344853 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -4184,6 +4184,7 @@ theme	Appearance	Erscheinungsbild
 @msg	select an object in perspective	wählen Sie ein Objekt in der Perspektive aus
 @msg	select artwork (or a colour group) to recolor	wählen Sie eine Grafik (oder eine Farbgruppe) zum Neufärben aus
 @msg	select at least two objects	wählen Sie mindestens zwei Objekte aus
+@msg	exit isolation mode first	beenden Sie zuerst den Isolationsmodus
 @msg	select objects, not layers	wählen Sie Objekte aus, keine Ebenen
 @msg	select one path, or give its `id`	wählen Sie einen Pfad aus oder geben Sie seine `id` an
 @msg	select paths to join	wählen Sie Pfade zum Zusammenfügen aus
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index 5a8799a43..3540bc823 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -4217,6 +4217,7 @@ theme	Appearance	Εμφάνιση
 @msg	select an object in perspective	επιλέξτε αντικείμενο σε προοπτική
 @msg	select artwork (or a colour group) to recolor	επιλέξτε σχέδιο (ή ομάδα χρωμάτων) για επαναχρωματισμό
 @msg	select at least two objects	επιλέξτε τουλάχιστον δύο αντικείμενα
+@msg	exit isolation mode first	βγείτε πρώτα από τη λειτουργία απομόνωσης
 @msg	select objects, not layers	επιλέξτε αντικείμενα, όχι επίπεδα
 @msg	select one path, or give its `id`	επιλέξτε μία διαδρομή ή δώστε το `id` της
 @msg	select paths to join	επιλέξτε διαδρομές για ένωση
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index a8b4cfb32..20277db77 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -4259,6 +4259,7 @@ axis	Both	Ambos
 @msg	select an object in perspective	selecciona un objeto en perspectiva
 @msg	select artwork (or a colour group) to recolor	selecciona la ilustración (o un grupo de colores) que quieres volver a colorear
 @msg	select at least two objects	selecciona al menos dos objetos
+@msg	exit isolation mode first	sal primero del modo de aislamiento
 @msg	select objects, not layers	selecciona objetos, no capas
 @msg	select one path, or give its `id`	selecciona un trazado o indica su `id`
 @msg	select paths to join	selecciona los trazados que quieres unir
diff --git a/crates/ui-egui/src/i18n/fi.tsv b/crates/ui-egui/src/i18n/fi.tsv
index 51ca6523c..ad2b1f261 100644
--- a/crates/ui-egui/src/i18n/fi.tsv
+++ b/crates/ui-egui/src/i18n/fi.tsv
@@ -4468,6 +4468,7 @@ imageTrace	Outline	Ääriviiva
 @msg	select an object in perspective	valitse perspektiivissä oleva objekti
 @msg	select artwork (or a colour group) to recolor	valitse uudelleenväritettävä kuvitus (tai väriryhmä)
 @msg	select at least two objects	valitse vähintään kaksi objektia
+@msg	exit isolation mode first	poistu ensin eristystilasta
 @msg	select objects, not layers	valitse objekteja, ei tasoja
 @msg	select one path, or give its `id`	valitse yksi polku tai anna sen `id`
 @msg	select paths to join	valitse liitettävät polut
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 3272215f7..a3b8a70b8 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -4256,6 +4256,7 @@ axis	Both	Les deux
 @msg	select an object in perspective	sélectionnez un objet en perspective
 @msg	select artwork (or a colour group) to recolor	sélectionnez l’illustration (ou un groupe de couleurs) dont redéfinir les couleurs
 @msg	select at least two objects	sélectionnez au moins deux objets
+@msg	exit isolation mode first	quittez d’abord le mode Isolation
 @msg	select objects, not layers	sélectionnez des objets, pas des calques
 @msg	select one path, or give its `id`	sélectionnez un tracé ou indiquez son `id`
 @msg	select paths to join	sélectionnez les tracés à joindre
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index d5b79d72e..9e4d5e586 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -4969,6 +4969,7 @@ imageTrace	Outline	Körvonal
 @msg	select an object in perspective	jelölj ki egy perspektivikus objektumot
 @msg	select artwork (or a colour group) to recolor	jelölj ki átszínezendő grafikát (vagy színcsoportot)
 @msg	select at least two objects	jelölj ki legalább két objektumot
+@msg	exit isolation mode first	előbb lépj ki az elkülönítési módból
 @msg	select objects, not layers	objektumokat jelölj ki, rétegeket ne
 @msg	select one path, or give its `id`	jelölj ki egy útvonalat, vagy add meg az `id` értékét
 @msg	select paths or anchor points	jelölj ki útvonalakat vagy horgonypontokat
diff --git a/crates/ui-egui/src/i18n/id.tsv b/crates/ui-egui/src/i18n/id.tsv
index bda640804..71d894fbe 100644
--- a/crates/ui-egui/src/i18n/id.tsv
+++ b/crates/ui-egui/src/i18n/id.tsv
@@ -4258,6 +4258,7 @@ imageTrace	Outline	Kontur
 @msg	select an object in perspective	pilih objek dalam perspektif
 @msg	select artwork (or a colour group) to recolor	pilih karya seni (atau grup warna) untuk diwarnai ulang
 @msg	select at least two objects	pilih setidaknya dua objek
+@msg	exit isolation mode first	keluar dari mode isolasi terlebih dahulu
 @msg	select objects, not layers	pilih objek, bukan lapisan
 @msg	select one path, or give its `id`	pilih satu jalur, atau berikan `id`-nya
 @msg	select paths to join	pilih jalur yang akan digabungkan
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index 4ef697112..bc12f151c 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -4299,6 +4299,7 @@ axis	Both	Entrambi
 @msg	select an object in perspective	seleziona un oggetto in prospettiva
 @msg	select artwork (or a colour group) to recolor	seleziona la grafica (o un gruppo colori) da ricolorare
 @msg	select at least two objects	seleziona almeno due oggetti
+@msg	exit isolation mode first	esci prima dalla modalità isolamento
 @msg	select objects, not layers	seleziona oggetti, non livelli
 @msg	select one path, or give its `id`	seleziona un tracciato o specifica il suo `id`
 @msg	select paths to join	seleziona i tracciati da unire
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index 22a9cd7db..4ac4b1df8 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -4092,6 +4092,7 @@ swatch	Bright Violet	ビビッドバイオレット
 @msg	clipboard is empty	クリップボードが空です
 @msg	no anchor points selected	アンカーポイントが選択されていません
 @msg	select at least two objects	オブジェクトを 2 つ以上選択してください
+@msg	exit isolation mode first	先に分離モードを終了してください
 @msg	no saved presets	保存したプリセットはありません
 @msg	compound paths can only contain paths	複合パスに含められるのはパスだけです
 @msg	no bounds	境界がありません
diff --git a/crates/ui-egui/src/i18n/ka.tsv b/crates/ui-egui/src/i18n/ka.tsv
index 21d7a6247..035f11e37 100644
--- a/crates/ui-egui/src/i18n/ka.tsv
+++ b/crates/ui-egui/src/i18n/ka.tsv
@@ -4022,6 +4022,7 @@ font-technology	Variable	ცვლადი
 @msg	select an object in perspective	მონიშნეთ ობიექტი პერსპექტივაში
 @msg	select artwork (or a colour group) to recolor	მონიშნეთ ხელახლა შესაფერადებელი ნახატი (ან ფერთა ჯგუფი)
 @msg	select at least two objects	მონიშნეთ ორი ობიექტი მაინც
+@msg	exit isolation mode first	ჯერ გამოდით იზოლაციის რეჟიმიდან
 @msg	select objects, not layers	მონიშნეთ ობიექტები და არა შრეები
 @msg	select one path, or give its `id`	მონიშნეთ ერთი ტრაექტორია ან მიუთითეთ მისი `id`
 @msg	select paths to join	მონიშნეთ შესაერთებელი ტრაექტორიები
diff --git a/crates/ui-egui/src/i18n/ko.tsv b/crates/ui-egui/src/i18n/ko.tsv
index 46ee1f775..e16ffc530 100644
--- a/crates/ui-egui/src/i18n/ko.tsv
+++ b/crates/ui-egui/src/i18n/ko.tsv
@@ -4024,6 +4024,7 @@ theme	Appearance	외관
 @msg	clipboard is empty	클립보드가 비어 있습니다
 @msg	no anchor points selected	선택한 앵커 포인트가 없습니다
 @msg	select at least two objects	개체를 두 개 이상 선택하세요
+@msg	exit isolation mode first	먼저 격리 모드를 종료하세요
 @msg	no saved presets	저장된 프리셋이 없습니다
 @msg	compound paths can only contain paths	컴파운드 패스에는 패스만 넣을 수 있습니다
 @msg	no bounds	경계가 없습니다
diff --git a/crates/ui-egui/src/i18n/nl.tsv b/crates/ui-egui/src/i18n/nl.tsv
index 59d7280d8..b09f5c1b7 100644
--- a/crates/ui-egui/src/i18n/nl.tsv
+++ b/crates/ui-egui/src/i18n/nl.tsv
@@ -4270,6 +4270,7 @@ imageTrace	Outline	Contour
 @msg	select an object in perspective	selecteer een object in perspectief
 @msg	select artwork (or a colour group) to recolor	selecteer een illustratie (of een kleurgroep) om te herkleuren
 @msg	select at least two objects	selecteer minstens twee objecten
+@msg	exit isolation mode first	verlaat eerst de isolatiemodus
 @msg	select objects, not layers	selecteer objecten, geen lagen
 @msg	select one path, or give its `id`	selecteer één pad, of geef het `id`
 @msg	select paths to join	selecteer paden om te verbinden
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index 74fe7890f..015763e57 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -4388,6 +4388,7 @@ imageTrace	Outline	Kontur
 @msg	select an object in perspective	zaznacz obiekt w perspektywie
 @msg	select artwork (or a colour group) to recolor	zaznacz kompozycję (lub grupę kolorów), aby zmienić kolory
 @msg	select at least two objects	zaznacz co najmniej dwa obiekty
+@msg	exit isolation mode first	najpierw wyjdź z trybu izolacji
 @msg	select objects, not layers	zaznacz obiekty, nie warstwy
 @msg	select one path, or give its `id`	zaznacz jedną ścieżkę lub podaj jej `id`
 @msg	select paths to join	zaznacz ścieżki do połączenia
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index a7cebfb79..45c606940 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -3831,6 +3831,7 @@ axis	Both	Ambos
 @msg	select an object in perspective	selecione um objeto em perspectiva
 @msg	select artwork (or a colour group) to recolor	selecione uma arte-final (ou um grupo de cores) para recolorir
 @msg	select at least two objects	selecione pelo menos dois objetos
+@msg	exit isolation mode first	saia do modo de isolamento primeiro
 @msg	select objects, not layers	selecione objetos, não camadas
 @msg	select one path, or give its `id`	selecione um traçado ou informe seu `id`
 @msg	select paths to join	selecione traçados para unir
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index 712bf3fe6..e222fd7c3 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -4295,6 +4295,7 @@ axis	Both	Оба
 @msg	select an object in perspective	выделите объект в перспективе
 @msg	select artwork (or a colour group) to recolor	выделите рисунок (или цветовую группу) для перекрашивания
 @msg	select at least two objects	выделите как минимум два объекта
+@msg	exit isolation mode first	сначала выйдите из режима изоляции
 @msg	select objects, not layers	выделите объекты, а не слои
 @msg	select one path, or give its `id`	выделите один контур или укажите его `id`
 @msg	select paths to join	выделите контуры для соединения
diff --git a/crates/ui-egui/src/i18n/sv.tsv b/crates/ui-egui/src/i18n/sv.tsv
index 9f25ce924..12ba977c0 100644
--- a/crates/ui-egui/src/i18n/sv.tsv
+++ b/crates/ui-egui/src/i18n/sv.tsv
@@ -4168,6 +4168,7 @@ axis	Both	Båda
 @msg	select an object in perspective	markera ett objekt i perspektiv
 @msg	select artwork (or a colour group) to recolor	markera grafik (eller en färggrupp) att färga om
 @msg	select at least two objects	markera minst två objekt
+@msg	exit isolation mode first	avsluta isoleringsläget först
 @msg	select objects, not layers	markera objekt, inte lager
 @msg	select one path, or give its `id`	markera en bana eller ange dess `id`
 @msg	select paths to join	markera banor att foga samman
diff --git a/crates/ui-egui/src/i18n/tr.tsv b/crates/ui-egui/src/i18n/tr.tsv
index f2553aef2..bf6958f3f 100644
--- a/crates/ui-egui/src/i18n/tr.tsv
+++ b/crates/ui-egui/src/i18n/tr.tsv
@@ -4024,6 +4024,7 @@ axis	Both	Her İkisi
 @msg	select an object in perspective	perspektifte bir nesne seç
 @msg	select artwork (or a colour group) to recolor	yeniden renklendirilecek resmi (veya bir renk grubunu) seçin
 @msg	select at least two objects	en az iki nesne seç
+@msg	exit isolation mode first	önce izolasyon modundan çık
 @msg	select objects, not layers	katmanları değil nesneleri seçin
 @msg	select one path, or give its `id`	bir yol seçin veya "kimliğini" verin
 @msg	select paths to join	katılmak için yolları seçin
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index c09c33934..fbe9134d9 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -4283,6 +4283,7 @@ axis	Both	Обидві
 @msg	select an object in perspective	виділіть об’єкт у перспективі
 @msg	select artwork (or a colour group) to recolor	виділіть малюнок (або колірну групу) для перефарбовування
 @msg	select at least two objects	виділіть як мінімум два об’єкти
+@msg	exit isolation mode first	спочатку вийдіть з режиму ізоляції
 @msg	select objects, not layers	виділіть об’єкти, а не шари
 @msg	select one path, or give its `id`	виділіть один контур або вкажіть його `id`
 @msg	select paths to join	виділіть контури для з’єднання
diff --git a/crates/ui-egui/src/i18n/vi.tsv b/crates/ui-egui/src/i18n/vi.tsv
index cde41165c..cd22afbdf 100644
--- a/crates/ui-egui/src/i18n/vi.tsv
+++ b/crates/ui-egui/src/i18n/vi.tsv
@@ -4621,6 +4621,7 @@ theme	Appearance	Giao diện
 @msg	select an object in perspective	hãy chọn đối tượng trong phối cảnh
 @msg	select artwork (or a colour group) to recolor	hãy chọn tác phẩm (hoặc nhóm màu) để tô lại
 @msg	select at least two objects	hãy chọn ít nhất hai đối tượng
+@msg	exit isolation mode first	hãy thoát chế độ cô lập trước
 @msg	select objects, not layers	hãy chọn đối tượng, không phải lớp
 @msg	select one path, or give its `id`	hãy chọn một đường dẫn hoặc cung cấp `id` của nó
 @msg	select paths or anchor points	chọn đường dẫn hoặc điểm neo
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 89eb9baba..ee84e8f43 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -3829,6 +3829,7 @@ imageTrace	Outline	轮廓
 @msg	clipboard is empty	剪贴板为空
 @msg	no anchor points selected	未选择锚点
 @msg	select at least two objects	请至少选择两个对象
+@msg	exit isolation mode first	请先退出隔离模式
 @msg	no saved presets	没有已保存的预设
 @msg	compound paths can only contain paths	复合路径只能包含路径
 @msg	no bounds	没有边界
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index ece9df22f..a6c14b778 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -1790,6 +1790,7 @@ file-filter	Templates	範本
 @msg	clipboard is empty	剪貼簿是空的
 @msg	no anchor points selected	未選取錨點
 @msg	select at least two objects	請選取至少兩個物件
+@msg	exit isolation mode first	請先結束隔離模式
 @msg	no saved presets	沒有已儲存的預設集
 @msg	compound paths can only contain paths	複合路徑只能包含路徑
 @msg	no bounds	沒有邊界
diff --git a/crates/ui-egui/src/menus/tests.rs b/crates/ui-egui/src/menus/tests.rs
index d22b73258..ed1fd2180 100644
--- a/crates/ui-egui/src/menus/tests.rs
+++ b/crates/ui-egui/src/menus/tests.rs
@@ -655,6 +655,53 @@ fn expand_appearance_is_an_object_menu_item_only() {
     assert_eq!(paths, [vec!["Object".to_string()]]);
 }
 
+/// In isolation mode, every item of Object › Lock and Object › Hide, Unlock All and Show All are
+/// greyed out, while Group stays on. After Exit Isolation Mode they are on again.
+#[test]
+fn lock_and_hide_menus_are_greyed_out_in_isolation_mode() {
+    let mut app = VectorcraftApp::new(vectorcraft_engine::Session::new(), crate::Services::default());
+    app.run("file.new", json!({})).unwrap();
+    let a = app.run("shape.rectangle", json!({"x": 10, "y": 10, "width": 50, "height": 50})).unwrap()["id"].clone();
+    let b = app.run("shape.rectangle", json!({"x": 80, "y": 10, "width": 50, "height": 50})).unwrap()["id"].clone();
+    app.run("select.set", json!({"ids": [a, b.clone()]})).unwrap();
+    let g = app.run("object.group", json!({})).unwrap()["id"].clone();
+    let lock_and_hide: Vec<String> = menu_entries(&app)
+        .into_iter()
+        .filter(|e| {
+            let path: Vec<&str> = e.path.iter().map(String::as_str).collect();
+            matches!(path[..], ["Object", "Lock" | "Hide"]) || path == ["Object"] && matches!(e.label.as_str(), "Unlock All" | "Show All")
+        })
+        .filter_map(|e| e.command)
+        .collect();
+    assert_eq!(
+        lock_and_hide,
+        [
+            "object.lock",
+            "object.lock.above",
+            "object.lock.otherLayers",
+            "object.unlockAll",
+            "object.hide",
+            "object.hide.above",
+            "object.hide.otherLayers",
+            "object.showAll"
+        ]
+    );
+    let shown = |app: &VectorcraftApp| -> Vec<bool> {
+        let entries = menu_entries(app);
+        lock_and_hide
+            .iter()
+            .chain([&"object.group".to_string()])
+            .map(|id| entries.iter().any(|e| e.command.as_ref() == Some(id) && e.enabled))
+            .collect()
+    };
+    app.run("object.isolate", json!({"id": g.clone()})).unwrap();
+    app.run("select.set", json!({"ids": [b]})).unwrap();
+    assert_eq!(shown(&app), [false, false, false, false, false, false, false, false, true], "in isolation mode");
+    app.run("object.exitIsolation", json!({})).unwrap();
+    app.run("select.set", json!({"ids": [g]})).unwrap();
+    assert_eq!(shown(&app), [true; 9], "after Exit Isolation Mode");
+}
+
 #[test]
 fn menus_are_as_wide_as_their_items() {
     // Items size the popup to the widest label and shortcut instead of the widest a menu may be.
diff --git a/crates/ui-egui/src/panels/properties.rs b/crates/ui-egui/src/panels/properties.rs
index e242086bb..5db382e74 100644
--- a/crates/ui-egui/src/panels/properties.rs
+++ b/crates/ui-egui/src/panels/properties.rs
@@ -146,7 +146,10 @@ pub fn show(app: &mut VectorcraftApp, ui: &mut Ui) {
     actions.push((tl!("Offset Path"), "object.path.offsetPath"));
     actions.push((tl!("Simplify"), "object.path.simplify"));
     actions.push((tl!("Arrange: Bring to Front"), "object.arrange.bringToFront"));
-    actions.push((tl!("Lock"), "object.lock"));
+    // Lock is listed only when Object › Lock › Selection is on, so not in isolation mode.
+    if crate::menus::enabled(app, "object.lock") {
+        actions.push((tl!("Lock"), "object.lock"));
+    }
     let w = (ui.available_width() - 6.0) / 2.0;
     for pair in actions.chunks(2) {
         ui.horizontal(|ui| {
diff --git a/crates/ui-egui/src/panels/properties/tests.rs b/crates/ui-egui/src/panels/properties/tests.rs
index edd778a89..4b6af376e 100644
--- a/crates/ui-egui/src/panels/properties/tests.rs
+++ b/crates/ui-egui/src/panels/properties/tests.rs
@@ -1286,6 +1286,27 @@ fn blend_options_is_a_quick_action_for_one_blend_with_the_blend_tool() {
     assert!(!shows(&tall(&mut app, &ctx, vec![]), "Blend Options"), "a rectangle");
 }
 
+/// Quick Actions have no Lock in isolation mode, where Object › Lock › Selection is off. Outside
+/// isolation mode Lock is there and locks the selection.
+#[test]
+fn lock_is_a_quick_action_outside_isolation_mode_only() {
+    let mut app = new_app();
+    let (a, b) = (rect(&mut app, 20.0, 20.0, 40.0, 40.0), rect(&mut app, 200.0, 20.0, 40.0, 40.0));
+    app.run("select.set", json!({"ids": [a.clone(), b]})).unwrap();
+    let g = app.run("object.group", json!({})).unwrap()["id"].clone();
+    app.run("object.isolate", json!({"id": g.clone()})).unwrap();
+    app.run("select.set", json!({"ids": [a]})).unwrap();
+    let ctx = egui::Context::default();
+    let texts = tall(&mut app, &ctx, vec![]);
+    assert!(shows(&texts, "Offset Path") && !shows(&texts, "Lock"), "no Lock in isolation mode: {texts:?}");
+    app.run("object.exitIsolation", json!({})).unwrap();
+    app.run("select.set", json!({"ids": [g.clone()]})).unwrap();
+    let texts = tall(&mut app, &ctx, vec![]);
+    press(&mut app, &ctx, text_at(&texts, "Lock").center());
+    let locked = app.session.doc().unwrap().doc.node(vectorcraft_doc::NodeId(g.as_u64().unwrap())).unwrap().locked;
+    assert!(locked, "Lock locks the group");
+}
+
 /// A Live Paint group selected with a path has Merge Live Paint in Quick Actions, which adds
 /// the path to the group in one undo step. Not for the group alone, nor for plain paths, nor
 /// with type selected, which Live Paint refuses.
diff --git a/docs/mcp.md b/docs/mcp.md
index 6bf025ee3..e4cd6d637 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -2161,6 +2161,11 @@ and `layerRows`, the rows highlighted in the panel.
   opens no rows for it and scrolls as with the option off. A change made with the panel's own rows, buttons or menu is
   not located, and a change made during a drag is located when the drag ends.
   A document opens with only its top-level layers open; the open rows are saved in the native file and reopen that way.
+- **Lock and Hide in isolation mode**: in isolation mode, Object › Lock's and Object › Hide's items (`object.lock`,
+  `object.lock.above`, `object.lock.otherLayers`, `object.hide`, `object.hide.above`, `object.hide.otherLayers`),
+  `object.unlockAll` and `object.showAll` are off, and a call returns the error "command `object.hide` is not
+  available right now: exit isolation mode first", with the command's own id. Pattern editing mode and opacity mask
+  editing do not count as isolation mode for these commands.
 - **Search and filter** (control channel and the app's MCP): the Search All field keeps the rows whose names hold the
   text typed, and `ui.layersFilter {objects?, layers?}` sets the choices of the Filter button beside it. `objects` (By
   Object) takes `paths` (paths and compound paths), `shapes` (live rectangles, ellipses, polygons and lines), `text`,
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index aab69f52e..5439f0edc 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -901,6 +901,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - **Neutral wording:** labels, MCP tool text, docs and packaging use neutral names, and `cargo xtask brands` (part of `cargo xtask ci`) fails on vendor names.
 - **Colour, type and file workflows:** Recolor Artwork (dialog with harmonies), Edit Colors, Find & Replace, Change Case, Smart Punctuation, Guides, Lock/Hide Above, Transform Each, Rasterize.
   Object › Lock › All Artwork Above and Object › Hide › All Artwork Above deselect the selected objects they lock or hide, the key object included.
+  In isolation mode, the items of Object › Lock and Object › Hide, Unlock All and Show All are greyed out ([lock, hide, and delete objects](https://web.archive.org/web/20220303070637/https://helpx.adobe.com/illustrator/using/locking-hiding-deleting-objects.html)); the Contextual Task Bar's Lock button is greyed out too, the Properties panel's Quick Actions have no Lock, and the commands return an error. Pattern editing mode and opacity mask editing do not count as isolation mode for them.
   Liquify (its brush Width, Height and Angle, Intensity, Detail, Simplify, Twirl Rate, Complexity, Horizontal and Vertical), Puppet Warp (its Expand and each pin's angle), Transform in Perspective (its depth), Nudge in Perspective (its direction) and Move Plane (its location or distance) refuse a value other than a number or null, such as "40", Draw in Perspective refuses a click point that is not two numbers, and Width Profile refuses a point that is not three numbers; each leaves the document and its undo history as they were.
   Object › Lock › All Artwork Above and Object › Hide › All Artwork Above go through each top-level layer once, checking each object that is not selected against the selected objects below it: with 100 tiles selected under 25,000 rectangles, Lock took 6.4 s and now takes under 0.1 s, and with all of 5,001 objects selected it took 8.8 s and now takes under 0.1 s.
   Lock Grid, Lock Station Point, Snap to Grid and Show Rulers (View › Perspective Grid) and Import Perspective Grid Presets (its choice to replace saved presets of the same names) refuse a value other than true, false or null, such as "true", and leave the grid and the saved presets as they were.