Created attachment 164049 [details]
Screen shot of monitor position set up.

SUMMARY
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Using a specific monitor display configuration in screen shot attachment, the taskbar does not auto hide. I have a Steam Deck built-in monitor set up below my Dell monitor, and I configure auto hide for the task manager. The taskbar does not auto hide but rather flickers on the Dell monitor instead. 
- When I change the Primary display to the Steam Deck built-in screen, with the same monitor position set up, the task bar shows up on Steam Deck screen, and functions normally. 
- Moving the built-in display to different location that is not below the Dell monitor causes the task bar to function normally. 
- Problem only occurs with this particular set up, shown in the screen shot attachment. 
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EXPECTED RESULT
Icon-only Task Manager auto hides regardless of whichever monitor is set to Primary, similar to Windows. 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: SteamOS 3.5.7
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.9