I was following this guide:
and right at the end of step 1, after hitting ctrl+alt+backspace and logging in again, I noticed that there are GUI elements missing from Nemo replaced with grey ⚠️ signs (see attached image)
in the end I couldn't achieve what I wanted by following the guide and I am giving up on it for now.
I would like help to undo the effects of the steps I took in the guide to restore the GUI elements.