diff --git a/crates/ui-egui/src/panels/project.rs b/crates/ui-egui/src/panels/project.rs
index 3db0d090..d7f6e9a3 100644
--- a/crates/ui-egui/src/panels/project.rs
+++ b/crates/ui-egui/src/panels/project.rs
@@ -795,7 +795,7 @@ pub fn show(app: &mut EffectcraftApp, ui: &mut egui::Ui, rect: Rect) {
                 ui.close();
             }
             if it.parent.is_some() && ui.button(crate::i18n::tr("Move to Project Root")).clicked() {
-                actions.push(("project.move".into(), json!({"items": [id.0], "folder": null})));
+                actions.push(("project.move".into(), json!({"items": targets(app, *id, selected), "folder": null})));
                 ui.close();
             }
             if !it.is_folder() && ui.button(crate::i18n::tr("Add to Composition")).clicked() {
diff --git a/crates/ui-egui/src/panels/timeline.rs b/crates/ui-egui/src/panels/timeline.rs
index ea6579d1..cbd0b58b 100644
--- a/crates/ui-egui/src/panels/timeline.rs
+++ b/crates/ui-egui/src/panels/timeline.rs
@@ -1890,7 +1890,7 @@ pub fn show(app: &mut EffectcraftApp, ui: &mut egui::Ui, rect: Rect) {
                         _ => start_rename(&ctx, layer.id.0, &layer.name),
                     }
                 }
-                layer_context_menu(&row_resp, layer, &mut actions);
+                layer_context_menu(&row_resp, &comp, layer, &selected, &mut actions);
                 // Switches.
                 let sws: [(Icon, bool, &str, bool); 8] = [
                     (Icon::Shy, sw.shy, "shy", true),
@@ -2104,7 +2104,7 @@ pub fn show(app: &mut EffectcraftApp, ui: &mut egui::Ui, rect: Rect) {
                             set_anchor(&ctx, cid, layer.id);
                         }
                     }
-                    layer_context_menu(&body, layer, &mut actions);
+                    layer_context_menu(&body, &comp, layer, &selected, &mut actions);
                     let drag_key = format!("bar-{}", layer.id.0);
                     for (resp, kind) in [(&body, "move"), (&lin, "in"), (&lout, "out")] {
                         if resp.dragged() {
@@ -3469,8 +3469,16 @@ fn prop_menu(
     item(ui, "essentialGraphics", "Add Property to Essential Graphics", false, "essential.addProperty", json!({"comp": comp.0, "layer": l, "prop": uid}));
 }
 
-fn layer_context_menu(resp: &egui::Response, layer: &Layer, actions: &mut Vec<(String, serde_json::Value)>) {
-    crate::widgets::context_menu(&resp, |ui| layer_menu(ui, &[layer.id.0], actions));
+/// A layer row's or bar's context menu. As in After Effects, right-clicking a layer that is part
+/// of the selection keeps the selection and the menu acts on all of it; right-clicking an
+/// unselected layer selects only that layer.
+fn layer_context_menu(resp: &egui::Response, comp: &Comp, layer: &Layer, selected: &[LayerId], actions: &mut Vec<(String, serde_json::Value)>) {
+    let in_selection = selected.contains(&layer.id);
+    if resp.secondary_clicked() && !in_selection && !layer.switches.locked {
+        actions.push(("layer.select".into(), json!({"layers": [layer.id.0]})));
+    }
+    let targets: Vec<u64> = if in_selection { comp.layers.iter().filter(|l| selected.contains(&l.id)).map(|l| l.id.0).collect() } else { vec![layer.id.0] };
+    crate::widgets::context_menu(&resp, |ui| layer_menu(ui, &targets, actions));
 }
 
 /// Shared layer actions for Timeline rows and Composition context menus.
diff --git a/crates/ui-egui/tests/ui_workflow_selection.rs b/crates/ui-egui/tests/ui_workflow_selection.rs
index 7b1ca768..00337c92 100644
--- a/crates/ui-egui/tests/ui_workflow_selection.rs
+++ b/crates/ui-egui/tests/ui_workflow_selection.rs
@@ -430,3 +430,82 @@ fn timeline_selected_effect_row_highlights() {
     assert!(h.state().session.state.selected_props.contains(&(id, fx)), "the click selects the effect");
     assert!(highlighted(&h), "the selected effect's row is highlighted");
 }
+
+/// Right-clicking a layer in the Timeline keeps the selection when the layer is part of it,
+/// so the context menu's commands act on every selected layer; right-clicking an unselected
+/// layer selects only it (After Effects). Reported on Discord: Pre-compose and Delete from the
+/// menu acted on the right-clicked layer only (#878).
+#[test]
+fn timeline_context_menu_acts_on_the_whole_selection() {
+    let right_click = |h: &mut Harness<'_, EffectcraftApp>, p: Pos2| {
+        for pressed in [true, false] {
+            h.input_mut().events.push(Event::PointerMoved(p));
+            h.input_mut().events.push(Event::PointerButton { pos: p, button: PointerButton::Secondary, pressed, modifiers: Modifiers::NONE });
+            h.step();
+        }
+        h.run_steps(3);
+    };
+    let row = |h: &Harness<'_, EffectcraftApp>, id: LayerId| {
+        let r = rect(h, &format!("timeline.layer.{}.row", id.0));
+        pos2(r.min.x + 210.0, r.center().y)
+    };
+    let bar = |h: &Harness<'_, EffectcraftApp>, id: LayerId| rect(h, &format!("timeline.layer.{}.bar", id.0)).center();
+    let mut h = harness();
+    let ids: Vec<LayerId> = h.state().session.active_comp().unwrap().layers.iter().map(|l| l.id).collect();
+    // Outline row: Delete removes both selected layers.
+    h.state_mut().session.execute("layer.select", json!({"layers":[ids[0].0, ids[1].0]})).unwrap();
+    h.run_steps(3);
+    let p = row(&h, ids[1]);
+    right_click(&mut h, p);
+    assert_eq!(h.state().session.state.selected_layers, vec![ids[0], ids[1]]);
+    h.get_by_label("Delete").click();
+    h.run_steps(3);
+    let left: Vec<LayerId> = h.state().session.active_comp().unwrap().layers.iter().map(|l| l.id).collect();
+    assert_eq!(left, vec![ids[2], ids[3]]);
+    h.state_mut().session.execute("edit.undo", json!({})).unwrap();
+    // Layer bar: same, with Duplicate.
+    h.state_mut().session.execute("layer.select", json!({"layers":[ids[2].0, ids[3].0]})).unwrap();
+    h.run_steps(3);
+    let p = bar(&h, ids[3]);
+    right_click(&mut h, p);
+    h.get_by_label("Duplicate").click();
+    h.run_steps(3);
+    assert_eq!(h.state().session.active_comp().unwrap().layers.len(), 6);
+    h.state_mut().session.execute("edit.undo", json!({})).unwrap();
+    // An unselected row: right-clicking selects only it.
+    h.state_mut().session.execute("layer.select", json!({"layers":[ids[0].0, ids[1].0]})).unwrap();
+    h.run_steps(3);
+    let p = row(&h, ids[3]);
+    right_click(&mut h, p);
+    assert_eq!(h.state().session.state.selected_layers, vec![ids[3]]);
+}
+
+/// The Project panel's Move to Project Root acts on every selected item when the right-clicked
+/// item is part of the selection, as Delete and Label do.
+#[test]
+fn project_context_move_to_root_acts_on_the_whole_selection() {
+    let mut h = harness();
+    let solids: Vec<u64> = {
+        let p = &h.state().session.project;
+        p.items.values().filter(|i| matches!(i.kind, effectcraft_engine::project::ItemKind::Solid(_))).map(|i| i.id.0).collect()
+    };
+    assert!(solids.len() >= 2);
+    let folder = h.state_mut().session.execute("project.newFolder", json!({"name":"Bin"})).unwrap()["item"].as_u64().unwrap();
+    h.state_mut().session.execute("project.move", json!({"items": solids, "folder": folder})).unwrap();
+    h.state_mut().ui.project_open_folders.insert(folder);
+    h.state_mut().session.execute("project.select", json!({"items": [solids[0], solids[1]]})).unwrap();
+    h.run_steps(3);
+    let p = rect(&h, &format!("project.item.{}.name", solids[1])).center();
+    for pressed in [true, false] {
+        h.input_mut().events.push(Event::PointerMoved(p));
+        h.input_mut().events.push(Event::PointerButton { pos: p, button: PointerButton::Secondary, pressed, modifiers: Modifiers::NONE });
+        h.step();
+    }
+    h.run_steps(3);
+    h.get_by_label("Move to Project Root").click();
+    h.run_steps(3);
+    let project = &h.state().session.project;
+    for id in &solids[..2] {
+        assert_eq!(project.item(effectcraft_engine::project::ItemId(*id)).unwrap().parent, None);
+    }
+}