Page previews do not appear in Pages panel and the cursor is a blue spinning ring

PC - Win11 - 32GBRAM, 8Gb GPU, Intel i9 12th gen

I’m working on a 32-page document with text and images.

I clicked or typed something (I don’t know what) and now the page previews do not appear in Pages panel and the cursor is a blue spinning ring, indicating the system is processing something. It works, when I click on things but I need the arrow back.

This happens whether Preflight is on or off.

Any ideas, anyone?

Johnny