I'm using the latest classic, the 12.1 and I have seen a floating box somehow. Like a cropped box which you can move around in your frame. Is that a floating panel? But if not does anyone know what that is called or how to get Lr to do that? Thanks
LrC has one floating panel – the Masks panel – which you can drag to anywhere on your screen.
Or it could be the 'Secondary Display panel'- Activated by F11 (Function key 11) or the  button-
Rob, thanks, let me check this out. It wasn't the floating panel. Will get back to you etc.
that's it. it also has a loupe function. Now can I put it in a box? Like a floating frame? Very cool. Very useful and thank you for solving this