diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1294,7 +1294,8 @@ fn autosum_menu(app: &mut SheetApp, ui: &mut Ui) {
 
 fn font_combo(app: &mut SheetApp, ui: &mut Ui, st: &Style) {
     let name = st.font.name.clone();
-    let resp = ui.add_sized([150.0, 24.0], egui::Button::new(egui::RichText::new(&name).font(theme::ui_font(12.5))));
+    // The trailing grow atom left-aligns the existing label inside the button.
+    let resp = ui.add_sized([150.0, 24.0], egui::Button::new(egui::RichText::new(&name).font(theme::ui_font(12.5))).right_text(()));
     control_keytip(app, ui, &resp, "home.fontName");
     let forced = invoke(app, "home.fontName");
     let items: Vec<(&str, String)> = FONTS.iter().map(|f| (*f, f.to_string())).collect();
diff --git a/crates/ui-egui/tests/keytips.rs b/crates/ui-egui/tests/keytips.rs
--- a/crates/ui-egui/tests/keytips.rs
+++ b/crates/ui-egui/tests/keytips.rs
@@ -522,6 +522,30 @@ fn pending_sequences_go_live_when_the_command_lands() {
     assert_eq!(h.state().keytips.prefix(), None);
 }
 
+#[test]
+fn font_name_box_left_aligns_short_and_long_names() -> Result<(), String> {
+    for name in ["Arial", "Calibri", "Times New Roman"] {
+        let mut session = blank();
+        session.execute("home.fontName", json!({"name": name})).map_err(|e| e.to_string())?;
+        let h = harness(session);
+        // Querying the original name also checks that the button keeps its accessible label.
+        let rect = h.get_by_role_and_label(egui::accesskit::Role::Button, name).rect();
+        assert!((rect.width() - 150.0).abs() < 0.1 && (rect.height() - 24.0).abs() < 0.1, "{name}: {rect:?}");
+        let text_x = h
+            .output()
+            .shapes
+            .iter()
+            .find_map(|shape| match &shape.shape {
+                egui::Shape::Text(text) if text.galley.text() == name && rect.contains(text.pos) => Some(text.pos.x),
+                _ => None,
+            })
+            .ok_or("font name was not painted inside its button")?;
+        let inset = text_x - rect.left();
+        assert!((0.0..=10.0).contains(&inset), "{name}: expected a small left inset, got {inset}");
+    }
+    Ok(())
+}
+
 #[test]
 fn control_keytips_open_dropdowns_and_run_handlers() {
     // HFF routes to the font control: its dropdown opens (popup items queryable).