Did some more testing today: All dialogs I opened looked good. Actually, I do not see any difference to the kf5 version I used before. The lag while scrolling has bothered me for over a year now. I just had hoped qt6 would fix it, but well... https://bugs.documentfoundation.org/show_bug.cgi?id=152911 looks related, I will investigate further (as my qt6 hopes are shattered) The problem occurs on my laptop (Intel CPU and graphics) and on the workstation (AMD CPU and Radeon graphics). I filed a bug for the scollbar: https://bugs.documentfoundation.org/show_bug.cgi?id=161424 Overview bug: I have to investigate. It's not occurring on my laptop.