The top, "File, Edit..." menu is gone from all my KDE program windows. Not sure what I changed.
I tried ctrl+m, looked in EVERY setting I can find for days but can not find a way to get my File menu back.
Best I can do is add a an item to the Title Bar buttons for, "Application Menu" which is ok but not what I want.
I've faced the same problem for quite a long time, trying all possible intuitive tricks and tips, but there's no change even after updating to Ubuntu 22.04 (KDE Plasma 5.24.7).
Today by chance I found the toggle! Now menu bars are back where a common user would expect them. I don't need to press Alt+F anymore to scroll out File options from top left corner of the main screen and move by keyboard arrows in the menu.
How to: Go to Settings -> Startup and Shutdown -> Background Services -> Startup Services -> turn off Application menus daemon.
You can add Global-menu widget and from there you have a menubar, resembling Gnome style.
It will look like nothing happened but when you next select an application with a menu, it will populate with options.
You can configure it too
You have to remove (drag it out) the three-line button from the screen you are showing. Then ctrl(+shift)+m will work
