SUMMARY in dual screen setup (with hidpi), maximizing windows on the screen without taskbar is maximized only until the size up to the line where taskbar would be. check screenshot https://i.imgur.com/lZTzmMk.png STEPS TO REPRODUCE 1. maximize window on the screen without taskbar (in dual screen setup) OBSERVED RESULT maximizes screen up to the position of taskbar leaving part of the screen empty EXPECTED RESULT maximize over full screen SOFTWARE/OS VERSIONS Linux/KDE Plasma: 5.3.11 KDE Plasma Version: 5.16.5 KDE Frameworks Version: 5.61 Qt Version: 5.12
*** This bug has been marked as a duplicate of bug 461142 ***