diff --git a/crates/ui-egui/src/panels/format_text_ui.rs b/crates/ui-egui/src/panels/format_text_ui.rs
index dd60b3bcc8..7b2763bf32 100644
--- a/crates/ui-egui/src/panels/format_text_ui.rs
+++ b/crates/ui-egui/src/panels/format_text_ui.rs
@@ -271,13 +271,20 @@ pub(crate) fn panel(
             let own = tl!("Auto").to_string();
             let shown = if e.line_spacing == 0.0 { own.clone() } else { number(e.line_spacing) };
             outlined(ui, |ui| {
-                let list = craft_ui::ComboBox::from_id_salt("format-line-spacing").selected_text(centred(ui, &shown)).width(half).show_ui(ui, |ui| {
-                    ui.selectable_value(&mut e.line_spacing, 0.0, own.as_str());
-                    for v in LINE_SPACINGS {
-                        ui.selectable_value(&mut e.line_spacing, v, number(v));
-                    }
-                });
-                list.response.labelled_by(label.id);
+                // The column is `half` wide in every language: a longer "Auto" is cut short (the
+                // menu and the tooltip have it whole).
+                ui.set_max_width(half);
+                let list = craft_ui::ComboBox::from_id_salt("format-line-spacing")
+                    .selected_text(centred(ui, &shown))
+                    .width(half)
+                    .wrap_mode(egui::TextWrapMode::Truncate)
+                    .show_ui(ui, |ui| {
+                        ui.selectable_value(&mut e.line_spacing, 0.0, own.as_str());
+                        for v in LINE_SPACINGS {
+                            ui.selectable_value(&mut e.line_spacing, v, number(v));
+                        }
+                    });
+                list.response.labelled_by(label.id).on_hover_text(&shown);
             });
             ui.add_space(8.0);
             ui.add_enabled_ui(false, |ui| {
@@ -382,11 +389,13 @@ struct Number<'a> {
 
 /// A combo box's selected text, centred in its button. The button lays out the text and then its
 /// arrow, and every growing atom takes an equal share of the room left: a pad as wide as the arrow
-/// before the text balances the arrow after it, and the text centres itself in its own share.
+/// before the text balances the arrow after it, and the text centres itself in its own share. Text
+/// longer than the list is wide (a translated "Auto") is cut short rather than widening it.
 fn centred<'a>(ui: &egui::Ui, text: &str) -> egui::Atoms<'a> {
     use egui::AtomExt as _;
     let pad = egui::Atom::custom(egui::IdSalt::new("combo-pad"), vec2(ui.spacing().icon_width, 0.0)).atom_grow(true);
-    egui::Atoms::new((pad, egui::Atom::from(text.to_string()).atom_grow(true).atom_align(egui::Align2::CENTER_CENTER)))
+    let text = egui::Atom::from(text.to_string()).atom_grow(true).atom_shrink(true).atom_align(egui::Align2::CENTER_CENTER);
+    egui::Atoms::new((pad, text))
 }
 
 /// The arrow that lists a field's common values, centred on the 26-point field beside it.
diff --git a/crates/ui-egui/tests/it/content.rs b/crates/ui-egui/tests/it/content.rs
index c4d2223824..a798505551 100644
--- a/crates/ui-egui/tests/it/content.rs
+++ b/crates/ui-egui/tests/it/content.rs
@@ -727,6 +727,8 @@ fn format_text_rows_line_up_and_fit_the_panel() {
 fn format_text_fits_the_tools_pane_at_its_narrowest() {
     use egui::accesskit::Role;
     let mut h = harness();
+    // At the largest interface size too: it scales points to pixels, and the layout is in points.
+    h.state_mut().set_option("ui-scale", "300").unwrap();
     h.state_mut().side_panels.tools_width = 0.0;
     assert!(h.state_mut().execute("edit.text"));
     h.run_steps(3);
@@ -752,6 +754,32 @@ fn format_text_fits_the_tools_pane_at_its_narrowest() {
     }
 }
 
+/// The lists in Format text fit the narrowest Tools pane in every interface language: "Auto" in
+/// the line spacing list is the one word in them that is translated, and in German, Ukrainian or
+/// Lao it is twice as long. The font list spans the pane, so nothing may end past it.
+#[test]
+fn format_text_lists_fit_the_narrowest_tools_pane_in_every_language() {
+    use egui::accesskit::Role;
+    for lang in pdfcraft_ui_egui::i18n::Lang::all() {
+        let mut h = harness();
+        // A script with no face on this machine (Lao without system fonts) can't be drawn at all.
+        if !h.ctx.fonts_mut(|f| f.has_glyphs(&egui::FontId::proportional(13.0), lang.name())) {
+            continue;
+        }
+        h.state_mut().set_option("language", lang.code()).unwrap();
+        h.state_mut().side_panels.tools_width = 0.0;
+        assert!(h.state_mut().execute("edit.text"));
+        h.run_steps(3);
+        let lists: Vec<egui::Rect> = h.query_all_by_role(Role::ComboBox).map(|n| n.rect()).collect();
+        // Found by its value (a font name, never translated), not as the widest list: an overrun
+        // could make another list the widest.
+        let font = h.query_all_by_role(Role::ComboBox).find(|n| n.value().as_deref() == Some("Helvetica")).map(|n| n.rect()).expect("the font list");
+        for r in &lists {
+            assert!(r.right() <= font.right() + 0.5, "{}: {r:?} reaches past the font list ({font:?})", lang.code());
+        }
+    }
+}
+
 #[test]
 fn format_text_panel_sets_alignment_and_lists_planned_controls_disabled() {
     use egui_kittest::kittest::NodeT;