SUMMARY In the context menu for the panel, the submenu for adding a new panel does not show up as submenu but windowed in the top left corner of the screen. STEPS TO REPRODUCE 1. Right click on panel 2. Move mouse to 'Add Panel' menu entry 3. Wait for submenu to show up OBSERVED RESULT Submenu opens in a window at the top left corner of the screen. EXPECTED RESULT Submenu should open at its proper location as menu. SOFTWARE/OS VERSIONS Linux: Arch Linux (available in About System) KDE Plasma Version: 5.19.90 KDE Frameworks Version: 5.74.0 Qt Version: 5.15.1 ADDITIONAL INFORMATION All other menus/submenus of the panel I could find are shown properly, this seems to be the only one left misbehaving (there were a few more misbehaving in 5.19.5).
*** This bug has been marked as a duplicate of bug 417378 ***