See screenshot
Code to reproduce


@Override
    public void start(Stage primaryStage) {
        setUserAgentStylesheet(STYLESHEET_MODENA);
        BorderPane root = new BorderPane();
        MenuBar bar = new MenuBar();
        
        Menu file = new Menu("File");
        file.getItems().add(new MenuItem("New"));
        bar.getMenus().add(file);
        root.setTop(bar);
        Scene scene = new Scene(root, 300, 300);
        primaryStage.setTitle("" + VersionInfo.getRuntimeVersion());
        primaryStage.setScene(scene);
        primaryStage.show();
    }