SUMMARY The title says it. I use X11 not Wayland. I have a plain Qt application for my wlan settings. Using the hamburger menu in the window title remove the main menu from this application too. That works so far well as long the application is started in front. Once the app is placed to the system tray the trouble begins. - Restore from the system tray to show the app => No hamburger menu in title bar and no main menu in the app - The app has a menu when click on its icon in the system tray. That menu has only the top actions but no sub menus now Not using this nice hamburger menu in the window title "solve" all issues.