Created attachment 110873 [details] screenshot My display scale is 1.2 under X11. See screenshot taken on Arch Linux.
hmm odd no idea why that happens will try to reproduce
See https://cgit.kde.org/kinfocenter.git/commit/?id=82e64226c2e628aab2afdcefdadf0246a59f1b71
Hmm I usually enable that on QtQuick apps, if you add that line does it fix your issue?
Dr. Chapatin is not a developer; I'm afraid you or someone else will have to answer that question. If you're not already aware, you can easily simulate HiDPI mode by running `QT_SCALE+FACTOR=1.5 apper`
https://phabricator.kde.org/D19793 fixes this issue