'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. | 