Does Your System run in Wayland or X11? You can check that with the Terminal Command echo $XDG_SESSION_TYPE
When it should show Wayland, You could try it with switching to X11/Xorg. To do that, go to the Login Screen. Click there on Your Profile so that the Passowrd Field appears. When it is appeared, You should see a Gear Icon in the bottom right Corner. click on it and choose the Option ''Zorin Desktop on Xorg'' and then log in.