About a year ago I moved to plasma6, and in playing with features enabled “global menus” out of ignorance, but only after realized it was just that weird apple-style menus I really hate. I couldn’t figure out how to disable them, so eventually just grew used to them begrudgingly.
Now upgrading from 6.2.3 to 6.3.2 (arch), all my global menu widgets are gone oddly, but my actual menus never came back to the actual application windows like libreoffice, pluma, and other gtk-ish things.
I really do not want global menus, but not really quite sure still how to disable/revert to non-global-menu usage. Most searches really lead to no answers, at least not for plasma6.
Edit Mode > Add or Manage Widgets > Global Menu > Remove all instances (button in the top right corner of the widget)
Settings > Colors & Themes > Window Decorations > Configure Titlebar Buttons…
There remove the Application Menu (“Hamburger”) button from your titlebars.
Actually, doing the first worked without getting to the second, once I figured out exactly what “edit mode” you were referring to, ie the desktop itself, and then finding there was even that option menu there to remove the instances.
That’s a bit of a trap I would say, I never understood why anyone liked that in macs, and this coming from someone their first pc was a mac128. Obviously people like mac-style for some reason, though I’ll never know why, but that option should come with a warning button to enable global menus to know how to revert if you end up hating it too.