how do I troubleshooting Quick Reference Panel which refuses to float on top of other apps?

I opened a doc in a Quick Reference Panel which worked fine, then Window → Float Quick Reference Panels is marked, but the QRP does not float. It is hidden when I open Chrome or other apps.
thanks in advance for your time and help

From the manual:

They only float over other project windows, not other apps.

Best

L

thanks very much !