catalina photos no thumbnails
I lost all my thumbnails in Photos when I was still on High Sierra. The update to Catalina has left me without thumbnails still. I go to the View menu, and the option for Show Thumbnails is gray. This is true for my three photo libraries. I have tried rotating a couple of images, but to no avail. I have done a lot of online searching, but again, no avail. Any help would be appreciated, as I am constantly working with a lot of photos.