I’m using LMDE 7 “Gigi” (Debian based Linux Mint). I love this distro, but there is annoying thing: weird cursor on any apps from flatpak, the cursor not following the system cursor. The fix is very simple, here what i did:
$ sudo flatpak override --env XCURSOR_THEME=Bibata-Modern-Classic
$ mkdir ~/.icons/default/cursors
$ cp -R -f /usr/share/icons/Bibata-Modern-Classic/cursors/. ~/.icons/default/cursors/And then restart the flatpak app, and viola, the cursor is beautiful.