F9 not working

I recently purchased Corel Suite 2021.  I primarily use Photo Paint and have for decades.  In this newer version, more often than not, the F9 (full screen preview function) doesn't work.  And yet when I click view/full screen at the top it works fine.  This is highly annoying and slows my workflow to a crawl as I constantly view the images I am working on in full screen mode to see how my edits look.  I was also going to program one of the buttons on my mouse to the F9 function but don't see much point if it doesn't work.  Are there any suggestions for how I could resolve this?

Randy

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