The trick is not to depend on pixel scaling (unless you have multiple screens at different pixel density), but to set the DPI for all toolkits ( GTK, Qt,...) to

The trick is not to depend on pixel scaling (unless you have multiple screens at different pixel density), but to set the DPI for all toolkits ( GTK, Qt,...) to the correct value. See https://wiki.archlinux.org/index.php/HiDPI https://wiki.archlinux.org/index.php/HiDPI on how to do that. For most parts setting an environment variable is sufficient. Takes you a long way. Older apps can be often scaled by setting DPI in X and use XWayland.