Qt with HiDPI (192) makes checkboxes in QMenu too small

I have DPI set to 192 in KDE (27" 4K monitor).

Qt5-based applications mostly look fine, but QMenus look small and checkboxes in them look very small.

I'm using Fusion theme.

Attached are 2 screenshots of kwrite - how checkboxes look in menus (too small) and in ordinary windows (normal).

Thanks