generating Library thumbnails

I’ve tried to regenerate thumbs in the library window instead of viewing it as a list and it won’t cooperate. I can only get the Preview window, but that means I can’t see my library-- I have to click on preview for each one. HOw can I get the thumbs back?

If you right-click on the Library, do you have View > Thumbnails selected?

When you regenerate the thumbnails, it’s actually regenerating the thumbnails in the scene, not the Library.