diff --git a/crates/ui-egui/src/canvas/selection.rs b/crates/ui-egui/src/canvas/selection.rs
index c2b0545df6..85edeac495 100644
--- a/crates/ui-egui/src/canvas/selection.rs
+++ b/crates/ui-egui/src/canvas/selection.rs
@@ -156,6 +156,9 @@ enum SelectionAction {
     Copy,
 }
 
+/// The selection bar's width before it has been laid out once (English labels).
+const SELECTION_BAR_GUESS: f32 = 520.0;
+
 /// Actions on an existing text selection, next to the selected words.
 pub(super) fn selection_actions(
     ui: &mut egui::Ui,
@@ -187,32 +190,33 @@ pub(super) fn selection_actions(
     if !viewport.intersects(rect) {
         return false;
     }
-    let x = rect.left().clamp(viewport.left() + 8.0, (viewport.right() - 520.0).max(viewport.left() + 8.0));
+    let id = egui::Id::unique(("text-selection-actions", view.id.0));
+    // The bar stays inside the pages' area, by the width it had last frame (its labels make it
+    // wider in some languages), so it never covers a side panel; a first guess before it has one.
+    let width = egui::AreaState::load(ui.ctx(), id).and_then(|a| a.size).map_or(SELECTION_BAR_GUESS, |s| s.x);
+    let x = rect.left().clamp(viewport.left() + 8.0, (viewport.right() - width - 8.0).max(viewport.left() + 8.0));
     let y = if rect.bottom() + 48.0 < viewport.bottom() { rect.bottom() + 6.0 } else { (rect.top() - 44.0).max(viewport.top() + 6.0) };
     let mut chosen = None;
-    egui::Area::new(egui::Id::unique(("text-selection-actions", view.id.0))).order(egui::Order::Foreground).fixed_pos(pos2(x, y)).show(
-        ui.ctx(),
-        |ui| {
-            egui::Frame::popup(ui.style()).show(ui, |ui| {
-                ui.horizontal(|ui| {
-                    for (label, action) in [
-                        (tl!("Add comment"), SelectionAction::Note),
-                        (tl!("Highlight"), SelectionAction::Markup(comments::CommentTool::Highlight)),
-                        (tl!("Underline"), SelectionAction::Markup(comments::CommentTool::Underline)),
-                        (tl!("Strikethrough"), SelectionAction::Markup(comments::CommentTool::StrikeOut)),
-                        (tl!("Replace text"), SelectionAction::Replace),
-                    ] {
-                        if ui.add_enabled(can_comment, egui::Button::new(label)).clicked() {
-                            chosen = Some(action);
-                        }
+    egui::Area::new(id).order(egui::Order::Foreground).fixed_pos(pos2(x, y)).show(ui.ctx(), |ui| {
+        egui::Frame::popup(ui.style()).show(ui, |ui| {
+            ui.horizontal(|ui| {
+                for (label, action) in [
+                    (tl!("Add comment"), SelectionAction::Note),
+                    (tl!("Highlight"), SelectionAction::Markup(comments::CommentTool::Highlight)),
+                    (tl!("Underline"), SelectionAction::Markup(comments::CommentTool::Underline)),
+                    (tl!("Strikethrough"), SelectionAction::Markup(comments::CommentTool::StrikeOut)),
+                    (tl!("Replace text"), SelectionAction::Replace),
+                ] {
+                    if ui.add_enabled(can_comment, egui::Button::new(label)).clicked() {
+                        chosen = Some(action);
                     }
-                    if ui.add_enabled(can_copy, egui::Button::new(tl!("Copy"))).clicked() {
-                        chosen = Some(SelectionAction::Copy);
-                    }
-                });
+                }
+                if ui.add_enabled(can_copy, egui::Button::new(tl!("Copy"))).clicked() {
+                    chosen = Some(SelectionAction::Copy);
+                }
             });
-        },
-    );
+        });
+    });
     let Some(action) = chosen else { return false };
     if let SelectionAction::Copy = action {
         // Copying closes the bar but keeps the words selected, for ⌘C or a second action.
diff --git a/crates/ui-egui/tests/it/comments.rs b/crates/ui-egui/tests/it/comments.rs
index 664f61733e..1d52d50954 100644
--- a/crates/ui-egui/tests/it/comments.rs
+++ b/crates/ui-egui/tests/it/comments.rs
@@ -3022,3 +3022,28 @@ fn an_upright_comment_on_a_turned_page_is_drawn_where_it_goes_before_release() {
     h.drop_at(from + delta);
     h.run_steps(3);
 }
+
+/// The selection bar stays inside the pages' area: its place was worked out for a 520 pt bar,
+/// so longer labels (German here) pushed it over the side panel next to a selection on the right.
+#[test]
+fn the_selection_bar_stays_inside_the_pages_area() {
+    let mut h = harness(|app| app.set_option("language", "de").unwrap());
+    // Narrower than the harness, as with a side panel open.
+    h.set_size(egui::vec2(1100.0, 900.0));
+    h.run_steps(4);
+    // The rightmost glyph of "The quick brown fox": the bar opens at its left.
+    let last = (0..64).filter_map(|i| h.state().views[0].glyph_screen_pos(0, i).map(|p| (i, p.x))).max_by(|a, b| a.1.total_cmp(&b.1)).unwrap().0;
+    h.state_mut().views[0].select_text(0, last, last);
+    h.run_steps(4);
+    let viewport = h.state().views[0].viewport_rect();
+    let (first, copy) = (h.get_by_label("Kommentar hinzufügen").rect(), h.get_by_label("Kopieren").rect());
+    let glyph = h.state().views[0].glyph_screen_pos(0, last).unwrap();
+    // The setup puts a bar opening at the glyph past the area's right edge.
+    assert!(
+        glyph.x + (copy.right() - first.left()) > viewport.right(),
+        "glyph at {}, bar {} wide, area {viewport:?}",
+        glyph.x,
+        copy.right() - first.left()
+    );
+    assert!(first.left() >= viewport.left() && copy.right() <= viewport.right(), "bar {first:?}..{copy:?} inside {viewport:?}");
+}