SUMMARY The theme preview won't close if the button in the upper right corner is pressed, ie nothing happens. It closes by Alt+F4 though. STEPS TO REPRODUCE 1. Go to System Settings 2. Go to Design 3. Show Breeze theme preview SOFTWARE/OS VERSIONS Operating System: Manjaro Linux KDE Plasma Version: 5.16.3 KDE Frameworks Version: 5.61.0 Qt Version: 5.13.0
I fixed this in 5.16.4 already! :)