how do you even make this work?

Finally trying 23.0.0 b16 and it takes forever to crawl thru the verify screen.  Then it takes forever to indicate it's even going to open.  Then I navigate to my folder and every thing shows up EXCEPT .mov files.  Then some errant key stroke turns the whole screen black and now what?  Fixed that was full screen with nothing to show and no F to shrink it.  Then without a prompt it imports my biggest folder on my computer by accident.   forever     Anyway, where's my files?  Cant even start.  Thanks anyone.