I have a first laptop with HiDPI screen and trying to set GUI scaling in .

I enabled experimntal fractional scaling, and set 166% scaling factor in Gnome settings.

For GDK apps there is no problem.
But many other apps are not scaled, or are scaled partly - window header bar is small. Is there universal solution to this? Or how do you set scaling on all GUI toolkits like GTK2, Electron, QT, Java?

Screenshot of 2.8K screen with gnome desktop scaled to 166%.
Firefox (flatpak) is scaled correctly,
Kdenlive (flatpak) is scaled correctly,
VLC (arch repo) window content is scaled, but header bar is not,
Bitwarden (flatpak) both window content and headerbar are not scaled.
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