Created attachment 154789 [details]
column names overlay

SUMMARY
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Hello, I want to change the columns order in system-monitor (process view). If system-monitor is windowed I can drag and drop the columns as expected.
When I put system-monitor in full-screen, the column can't be ordered anymore and I get some glitches
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STEPS TO REPRODUCE
1. Open System Monitor (windowed)
2. Go in the Process View
3. Right click on the column titles and click on the only option (change/modify columns)
4. Try to move up and down any column dragging it (it should work fine)
5. Put system-monitor in full-screen mode
6. Try to move up and down any column dragging it (it doesn't work fine)

(I can try to provide a screen recorder if you need it)

OBSERVED RESULT
The column order doesn't change. You can't drag the columns up or down and the dragging seems to be applied on the background system-monitor window (the list of processes).
If you can move something up or down, you'll end with messed column names (see attached image)

Operating System: RebornOS Linux (Arch)
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Kernel Version: 6.0.12-arch1-1 (64-bit)
Graphics Platform: Wayland