This is a Qt6 specific bug. Mouse, stylus and arrow keys don't work on the Font Family list of Text Properties panel, items have no highlight, therefore no font can be chosen. Tested with: krita-6.1.0-prealpha-70631e374b-x86_64.appimage Working as intended on: krita-5.4.0-prealpha-70631e374b-x86_64.appimage
*** This bug has been marked as a duplicate of bug 515548 ***