To find the mouse pointer it has a option in the Accessibility section in the Settings. Pointing & Clicking >> “Locate Pointer” It highlights the location if you click the left Ctrl. key. Have a look if this would help you.
As you can imagine, the majority of the users / developers are going for Wayland. Faster changes is the result of it.
But if you really need go back to x11 you can undo the changes made. See topic below:
Removing the x11 session in GDM brought you so far that you also checked out Wayland. This is good and I think on long term the way to go. When ever moving back to x11 remember that this is just temporary available. For this it is important, always to have also a look in Wayland what is going on.