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This tutorial applies mainly to Gnome 3, although some things may be applicable in Gnome 4.
Some applications use the KDE cursor
When using applications written in QT appears cursor from KDE Plasma. The solution is this:
sudo update-alternatives --set x-cursor-theme /usr/share/icons/Adwaita/cursor.theme
PS: You can see a list of all available cursors with the command:
update-alternatives --list x-cursor-theme