I was wondering if I could move the menu which appears when I click the Alt key to the top bar. I know this sounds stupid but I don't want it take up space on my window.
21 Answer
Essentially, having the user menu appear in the top bar instead of under the title bar of the application window is not supported in Gnome Shell, which is the default desktop of Ubuntu since version 17.10. This indeed in contrast to the Unity shell, where having that menu in the top bar (for supported applications) was a core feature.
The Gnome developers themselves probably will not have any interest in implementing the feature. They want to get rid of that user menu altogether. You will have noticed that Gnome applications like Files (nautilus), Evince (PDF viewer), Gedit (the editor) do not anymore feature such user menu. Instead, options are exposed through buttons in the header bar of the application.
In another answer to a similar question, the use of an extension Gnome Global Menu Extension is indicated. The answer, however, was not accepted. Indeed, it works (worked?) only for a limited number of applications. Moreover, the extension has not anymore been recently updated.
If you insist on this feature, you may need to consider using another desktop. The Mate desktop has very good support for such feature. Indeed, they have even a build-in mode to emulate the Unity desktop. Support for the global menu is actually relying on the efforts of the Unity team.
Another option is the KDE-desktop. Also that desktop has quite good optional support for a global menu.
In any of these cases, not all applications are supported, as applications in Linux can use different toolkits to render their graphical user interface.
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