Steps to reproduce: * Go to System Settings -> Application Style -> Widget Style, and select some style with a fixed scrollbar such as Oxygen or QTCurve. * Click Configure next to the style name, go to "Scrollbars" (for Oxygen), increase scrollbar width. Expected behavior: arrow pointers at the top and bottom of the bar should increase in size as the bar width increases. Actual behavior: arrow pointers stay the same size, becoming much smaller than the scrollbar itself as the size grows.
I can confirm on my system. Operating System: Arch Linux KDE Plasma Version: 5.15.4 KDE Frameworks Version: 5.57.0 Qt Version: 5.12.3