OK, found the solution which is specific to XFCE and a couple of other DE's that don't have native tools to mount Google Drive. It can be done two ways, as noted in the link below.
When I upgraded to 20.1, I had forgotten that I needed the ocamlfuse PPA (which I lost during the upgrade) to make this work. Here is the full solution in a tutorial. I can confirm that it works just fine in XFCE. Just note that it is SLOW when retrieving a file list from a directory on Google Drive that contains a lot of files. The file manager has not locked up. Just give it time.
https://www.linuxuprising.com/2018/07/m ... -mate.html
I think I am going to try installing the Gnome dependencies and use the Gnome Control Center on my other machine just to be able to compare the two.
Frank.