diff --git a/crates/ui-egui/src/component_panel.rs b/crates/ui-egui/src/component_panel.rs
index 646d6ecd..719c2588 100644
--- a/crates/ui-egui/src/component_panel.rs
+++ b/crates/ui-egui/src/component_panel.rs
@@ -20,7 +20,8 @@ use serde_json::{Value, json};
 use crate::FigApp;
 use crate::i18n::{tr, tr_noop, trn};
 use crate::icons::{self, Icon};
-use crate::right::{menu_item, menu_popup, row};
+use crate::list_drag::ListDrag;
+use crate::right::{menu_item, menu_popup, row, row_rect};
 use crate::theme::{COMPONENT, Tokens, semibold};
 use crate::widgets;
 
@@ -241,9 +242,11 @@ fn properties_ui(app: &mut FigApp, ui: &mut Ui, doc: &Document, owner: NodeId) {
     } else {
         Default::default()
     };
-    // Variant properties: name, values (the matrix), add value, delete.
-    for (k, vals) in &variants {
-        row(ui, 32.0, |ui| {
+    // Variant properties: name, values (the matrix), add value, delete. Dragged by their left
+    // margin to reorder them (only among themselves: the shared ones keep the engine's order).
+    let mut drag = ListDrag::in_order(ui, ("variant_props", owner));
+    for (i, (k, vals)) in variants.iter().enumerate() {
+        let header = row_rect(ui, 32.0, |ui| {
             let (ir, _) = ui.allocate_exact_size(vec2(14.0, 14.0), Sense::hover());
             icons::paint(ui.painter(), ir, Icon::ComponentSet, COMPONENT);
             if let Some(nn) = widgets::text_field(ui, Id::new(("vprop_name", owner, k.as_str())), k, 110.0, tr("Name")) {
@@ -284,6 +287,12 @@ fn properties_ui(app: &mut FigApp, ui: &mut Ui, doc: &Document, owner: NodeId) {
             });
             vi += 3;
         }
+        drag.row(ui, i, header, header.with_max_y(ui.cursor().min.y.max(header.max.y)), || k.clone());
+    }
+    if let Some((from, to)) = drag.finish(ui)
+        && let Some((k, _)) = variants.get(from)
+    {
+        app.run("component.editProperty", json!({"id": owner, "name": k, "index": to}));
     }
     // Shared properties.
     for (k, d) in &defs {
diff --git a/crates/ui-egui/src/component_props_reorder_tests.rs b/crates/ui-egui/src/component_props_reorder_tests.rs
new file mode 100644
index 00000000..729185ce
--- /dev/null
+++ b/crates/ui-egui/src/component_props_reorder_tests.rs
@@ -0,0 +1,125 @@
+//! Dragging variant properties in a component set's Properties section, driven through egui
+//! headless: a property dragged by its left margin moves in one undo step (its values go with it,
+//! instances follow), its fields don't start a drag, and Escape cancels.
+
+use egui::{Event, Pos2, vec2};
+use figcraft_doc::NodeId;
+use figcraft_engine::Session;
+use serde_json::json;
+
+use crate::layers_drag_tests::Ui;
+use crate::list_drag::grip_id;
+
+fn id(v: serde_json::Value) -> NodeId {
+    NodeId(v["id"].as_u64().unwrap())
+}
+
+/// A selected set whose variants list Size then State (two values each), a shared boolean "Icon",
+/// and an instance of the set. Returns (ui, set, instance).
+fn setup() -> (Ui, NodeId, NodeId) {
+    let mut s = Session::new();
+    let mut variants = Vec::new();
+    for (k, name) in ["Size=Small, State=Default", "Size=Large, State=Default", "Size=Small, State=Hover"].iter().enumerate() {
+        let f = id(s.execute("frame.create", &json!({"x": 0, "y": k * 60, "width": 80, "height": 40, "name": name})).unwrap());
+        variants.push(id(s.execute("component.create", &json!({"ids": [f]})).unwrap()));
+    }
+    let set = id(s.execute("component.combineVariants", &json!({"ids": variants})).unwrap());
+    s.execute("component.addProperty", &json!({"id": set, "name": "Icon", "type": "boolean", "default": true})).unwrap();
+    let inst = id(s.execute("instance.create", &json!({"component": set, "x": 400, "y": 0})).unwrap());
+    s.execute("select.set", &json!({"ids": [set]})).unwrap();
+    (Ui::new(s), set, inst)
+}
+
+/// Property names of `id` (a set or an instance), in the order they're listed.
+fn names(u: &mut Ui, id: NodeId) -> Vec<String> {
+    let props = u.app.session.execute("component.properties", &json!({"id": id})).unwrap();
+    props["properties"].as_array().unwrap().iter().map(|p| p["name"].as_str().unwrap().to_string()).collect()
+}
+
+fn undo_len(u: &Ui) -> usize {
+    u.app.session.ds().unwrap().history.undo.len()
+}
+
+/// The middle of the grip of variant property `index` (as laid out last frame).
+fn grip(u: &Ui, set: NodeId, index: usize) -> Option<Pos2> {
+    u.ctx.read_response(grip_id(("variant_props", set), index)).map(|r| r.rect.center())
+}
+
+/// Press at `from`, move to `to` in small steps, and leave the button down.
+fn drag(u: &mut Ui, from: Pos2, to: Pos2) {
+    u.button(from, true);
+    for k in 1..=10 {
+        u.frame(vec![Event::PointerMoved(from + (to - from) * (k as f32 / 10.0))]);
+    }
+}
+
+#[test]
+fn dragging_a_variant_property_reorders_it_in_one_step() {
+    let (mut u, set, inst) = setup();
+    assert_eq!(names(&mut u, set), ["Size", "State", "Icon"]);
+    let (size, state) = (grip(&u, set, 0).expect("variant properties have a grip"), grip(&u, set, 1).unwrap());
+    assert!(size.y < state.y, "listed in order");
+    let undo = undo_len(&u);
+    // State above Size.
+    let to = size - vec2(0.0, 12.0);
+    drag(&mut u, state, to);
+    assert_eq!(names(&mut u, set), ["Size", "State", "Icon"], "nothing moves before the drop");
+    u.button(to, false);
+    assert_eq!(names(&mut u, set), ["State", "Size", "Icon"]);
+    assert_eq!(names(&mut u, inst), ["State", "Size", "Icon"], "the instance lists the new order");
+    let doc = u.app.session.doc().unwrap();
+    let first = doc.node(set).unwrap().children[0];
+    assert!(doc.node(first).unwrap().name.starts_with("State="), "{}", doc.node(first).unwrap().name);
+    assert_eq!(undo_len(&u), undo + 1);
+    assert!(u.app.ui.last_error.is_none(), "{:?}", u.app.ui.last_error);
+    // Dropped where it is: nothing changes.
+    u.frame(vec![]);
+    u.frame(vec![]);
+    let g = grip(&u, set, 0).unwrap();
+    drag(&mut u, g, g + vec2(0.0, 6.0));
+    u.button(g + vec2(0.0, 6.0), false);
+    assert_eq!(undo_len(&u), undo + 1);
+    assert!(u.app.session.undo().unwrap());
+    assert_eq!(names(&mut u, set), ["Size", "State", "Icon"]);
+}
+
+#[test]
+fn a_property_dropped_under_the_last_ones_values_lands_last() {
+    let (mut u, set, _) = setup();
+    let size = grip(&u, set, 0).unwrap();
+    // State's header is 32 high and its value row 30 under it: 58 down is on the value row, below
+    // the header's half-row slack, so only an area that takes in the values counts it.
+    let state = u.ctx.read_response(grip_id(("variant_props", set), 1)).unwrap().rect;
+    let to = Pos2::new(size.x, state.min.y + 58.0);
+    drag(&mut u, size, to);
+    u.button(to, false);
+    assert_eq!(names(&mut u, set), ["State", "Size", "Icon"]);
+}
+
+#[test]
+fn pressing_the_name_field_does_not_start_a_drag() {
+    // A guard: on main there's no grip at all; it fails if the whole row becomes a drag handle.
+    let (mut u, set, _) = setup();
+    let (size, state) = (grip(&u, set, 0).unwrap(), grip(&u, set, 1).unwrap());
+    let undo = undo_len(&u);
+    let field = size + vec2(60.0, 0.0);
+    drag(&mut u, field, Pos2::new(field.x, state.y + 40.0));
+    u.button(Pos2::new(field.x, state.y + 40.0), false);
+    assert_eq!(names(&mut u, set), ["Size", "State", "Icon"]);
+    assert_eq!(undo_len(&u), undo);
+}
+
+#[test]
+fn escape_cancels_a_property_drag_and_keeps_the_selection() {
+    // A guard: the cancel comes from the shared list drag.
+    let (mut u, set, _) = setup();
+    let (size, state) = (grip(&u, set, 0).unwrap(), grip(&u, set, 1).unwrap());
+    let undo = undo_len(&u);
+    let to = size - vec2(0.0, 12.0);
+    drag(&mut u, state, to);
+    u.frame(vec![Event::Key { key: egui::Key::Escape, physical_key: None, pressed: true, repeat: false, modifiers: Default::default() }]);
+    u.button(to, false);
+    assert_eq!(names(&mut u, set), ["Size", "State", "Icon"]);
+    assert_eq!(undo_len(&u), undo);
+    assert_eq!(u.app.session.ds().unwrap().selection, [set], "the Escape only cancels the drag");
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 6e3dfe87..b214b3c6 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -85,6 +85,8 @@ mod colorpicker_selection_tests;
 #[cfg(test)]
 mod comments_tests;
 #[cfg(test)]
+mod component_props_reorder_tests;
+#[cfg(test)]
 mod cursors_tests;
 #[cfg(test)]
 mod design_paste_tests;