STEPS TO REPRODUCE 1. Log in wayland based WM (sway, weston, wayfire... but kwin not tested) 2. Start kcharselect with QT_QPA_PLATFORM=wayland OBSERVED RESULT Kcharselect stretches 15000+ pixels wide SOFTWARE/OS VERSIONS ArchLinux KDE Plasma Version: 5.23.5 KDE Frameworks Version: 5.89.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION QT_QPA_PLATFORM=xkb kcharselect works fine