I opened krita today and the UI text was super tiny. I’ve had this problem before, so I went into the window settings in configure krita. Hi-DPI support is enabled already, so I used custom interface font to enlarge the text. The problem is, that doesn’t work with the tool options bar (image below), no matter how many times I try. Also, the text for the file name is small as well. Not that it matters much as the tool options bar, but I’d prefer that to be bigger as well.
(for reference)

