In the plasma 13 announcment (https://www.kde.org/announcements/plasma-5.13.0.php), you announce global menu now works with Gtk apps (as a tech preview). Is there any thing to do to make it workgin? For me, it's still works for Kde / Qt apps, but not for gtk apps like libreoffice or gimp. Is there any thing to configure ? I see nothing about that in the control panel...
GTK apps often need to be patched for them to export their menus; Ubuntu typically does this for apps in their *official* repository.
*** This bug has been marked as a duplicate of bug 391868 ***