diff --git a/crates/ui-egui/src/custom_toolbars.rs b/crates/ui-egui/src/custom_toolbars.rs
index fa2be21c0..adbf1223f 100644
--- a/crates/ui-egui/src/custom_toolbars.rs
+++ b/crates/ui-egui/src/custom_toolbars.rs
@@ -343,7 +343,10 @@ pub(crate) fn show_dialog(app: &mut VectorcraftApp, ctx: &egui::Context) {
             }
         });
         ui.add_space(16.0);
-        ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+        // As wide as the field and as tall as the buttons, as in `dialogs::show`: a right-to-left
+        // layout would take all the height left in the window and center the buttons in it.
+        let row = egui::vec2(ui.min_rect().width(), ui.spacing().interact_size.y);
+        ui.allocate_ui_with_layout(row, egui::Layout::right_to_left(egui::Align::Center), |ui| {
             if widgets::primary_button(ui, tl!("OK")).clicked() {
                 ok = true;
             }
@@ -445,7 +448,8 @@ pub(crate) fn show_manage(app: &mut VectorcraftApp, ctx: &egui::Context) {
             }
         });
         ui.add_space(16.0);
-        ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+        let row = egui::vec2(ui.min_rect().width(), ui.spacing().interact_size.y);
+        ui.allocate_ui_with_layout(row, egui::Layout::right_to_left(egui::Align::Center), |ui| {
             if widgets::primary_button(ui, tl!("OK")).clicked() {
                 ok = true;
             }
diff --git a/crates/ui-egui/src/dialogs/tests.rs b/crates/ui-egui/src/dialogs/tests.rs
index 0a9b6d90b..51959c320 100644
--- a/crates/ui-egui/src/dialogs/tests.rs
+++ b/crates/ui-egui/src/dialogs/tests.rs
@@ -463,6 +463,39 @@ fn dialogs_do_not_stretch_to_the_screen() {
     assert!(checked >= 10, "only {checked} dialogs drew in the shared frame");
 }
 
+#[test]
+fn workspace_and_toolbar_dialogs_end_at_their_buttons() {
+    // New Workspace, Manage Workspaces, New Toolbar and Manage Toolbars draw their own windows: each
+    // ends just below its OK button, with no empty band above or below the buttons.
+    for (kind, fields, window) in [
+        ("newWorkspace", json!({"name": "Mine"}), "dialog-workspace"),
+        ("manageWorkspaces", json!({"selected": "", "name": ""}), "dialog-workspace"),
+        (crate::custom_toolbars::KIND, json!({"name": "Toolbar 1"}), "dialog-new-toolbar"),
+        (crate::custom_toolbars::MANAGE, json!({"selected": "", "name": ""}), "dialog-manage-toolbars"),
+    ] {
+        let mut app = app();
+        open(&mut app, kind, fields);
+        let ctx = egui::Context::default();
+        theme::install_fonts(&ctx);
+        theme::apply(&ctx, Default::default());
+        let screen = egui::Rect::from_min_size(egui::Pos2::ZERO, egui::vec2(1600.0, 1000.0));
+        let mut ok = None;
+        for _ in 0..4 {
+            let input = egui::RawInput { screen_rect: Some(screen), ..Default::default() };
+            let mut out = ctx.run_ui(input, |ui| show(&mut app, ui.ctx()));
+            out.textures_delta.clear();
+            ok = out.shapes.iter().find_map(|c| match &c.shape {
+                egui::Shape::Text(t) if t.galley.text() == "OK" => Some(t.visual_bounding_rect()),
+                _ => None,
+            });
+        }
+        let ok = ok.unwrap_or_else(|| panic!("{kind} draws no OK button"));
+        let outer = ctx.memory(|m| m.area_rect(egui::Id::unique(window))).unwrap();
+        let below = outer.bottom() - ok.bottom();
+        assert!(below < 40.0, "{kind}: {below} pt between OK and the bottom of its {} pt window", outer.height());
+    }
+}
+
 /// The dialog window of `app`'s open dialog after a few frames in a `w` × 900 window.
 fn dialog_rect(app: &mut VectorcraftApp, w: f32) -> egui::Rect {
     let ctx = egui::Context::default();
diff --git a/crates/ui-egui/src/workspaces.rs b/crates/ui-egui/src/workspaces.rs
index 4b2b31806..d7590ff3b 100644
--- a/crates/ui-egui/src/workspaces.rs
+++ b/crates/ui-egui/src/workspaces.rs
@@ -519,7 +519,10 @@ pub fn show(app: &mut VectorcraftApp, ctx: &egui::Context) {
             ui.label(egui::RichText::new(tl!("Saves the current bars, toolbar and panel layout.")).color(t.text_dim).size(11.0));
         }
         ui.add_space(16.0);
-        ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+        // As wide as the fields and as tall as the buttons, as in `dialogs::show`: a right-to-left
+        // layout would take all the height left in the window and center the buttons in it.
+        let row = egui::vec2(ui.min_rect().width(), ui.spacing().interact_size.y);
+        ui.allocate_ui_with_layout(row, egui::Layout::right_to_left(egui::Align::Center), |ui| {
             if widgets::primary_button(ui, tl!("OK")).clicked() {
                 ok = true;
             }