Created attachment 169214 [details]
output from xrandr

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SUMMARY
After updating to plasma 6 (from plasma 5), switching display (with Win + P) shortcut does not fully work. I am using two equal-sized screens. The on-screen display appears, and I can select the different arrangements, but no option makes a difference. Screens can be manipulated successfully in the settings menu (change position, toggle active).

STEPS TO REPRODUCE
1. Hit Win + P to bring up the display switch mini-window
2. Select a different layout or screen setup

OBSERVED RESULT
No changes to screen layout. No screen switches off if requested.

EXPECTED RESULT
Requested layout to be applied.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Kernel 6.8.8-arch1-1 (64-bit)
(available in About System)
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0

ADDITIONAL INFORMATION
(See attachment for xrandr output).