We support 4K scaling on virtually any system (Windows, Linux and macOS), with only a few exceptions on Linux. We support it on all Linux distribution, provided you install Gnome tweaks and configure the Gnome window scaling. There is no standardized way to get the scale info, and each window manager/GUI toolkit does it differently. So it will work on 100% of all Linux systems, our software just needs to be told what scale to use, which the fallback is to read from Gnome tweak window scaling.
We don’t currently support reading KDE scaling info.
We support Ubuntu -> System Settings -> Displays -> Scale for menu and title bars. In Gnome -> Tweak Tools -> Windows -> Window Scaling.