Application UI scaling

Now that is interesting ... Having pulled the System Settings window onto the side monitor text on some pages becomes too large. In particular the Display Configuration page can't display the screen names in their boxes. Move the page to the right onto the main screen and it scales the whole page from 1920x1080 to 2,232 × 1,560 and this is not affected ny the 'global scale' setting so must be something that is changed based on the screen resolution. THAT does not help when there are different resolution monitors attached, something I have used for many years in other locations. Other applications do seem to scale the window size based on the 'global scale' settings and those have to be restarted after changes to the system settings to see the changes. The problem now is just what application toolkit is being used by the application and how do we change that element. LibreOffice is a good starting point and a bug on their forum highlights that even this can be selectable. While this refers to 'Wayland' it equally applies to X11 I think. Checking out things like 'inxi -Gxxz' found on this thread confirms that while wayland is loaded it's inactive. Using wayland is getting mixed reviews and since X11 is still working fine I see not reason to bother with it at all.

I think that my next target has to be Qt6 and the control panel for that is currently saying it is not loaded properly so a good starting point. Environmental settings need adding which have not been handled by the various installers? QT_QPA_PLATFORMTHEME = qt6ct seems to be what is missing.

'QT_QPA_PLATFORM=xcb' is not necessary for LibreOffice since it is already reporting that it is using xcb so perhaps trying "SAL_USE_VCLPLUGIN=gtk4" to to use the alternate gtk toolkit. However that seems to be more problematic on high resolution monitors. PDF Arranger is using gtk3 and it's top windows bar has irritatingly small icons so the right click menu gets used instead.