Further analysis by Milan Crha shows that the issue under Xorg seems to be caused by Ubuntu's gtk3, see https://gitlab.gnome.org/GNOME/evolution/-/issues/1972#note_1524307.
Further analysis by Milan Crha shows that the issue under Xorg seems to be caused by Ubuntu's gtk3, see https:/ /gitlab. gnome.org/ GNOME/evolution /-/issues/ 1972#note_ 1524307.