The help file says that the right pane contains thumbnails of the most recent documents

I have NO thumbnails on this computer. My other computer does have them. How do I get them on mine? I have totally deleted LibOff and reinstalled with the current version. What next?

It’s an educated guess you’re talking about the start center. Thumbnails appear in the right pane whenever a LO document is opened. If you have deleted/reinstalled, then there is no history to display.