I can confirm that issue on the latest development version of Ubuntu 20, on HiDPI 15" display (3840x2160) flatpak version looks less or more correct (still not very usable) and icon size setting works. repository version has tiny icons and icon size settings does not work.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1817389 Title: GIMP icon sizes small on large and huge setting To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/1817389/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
