When I open PE2023, the screen is small. Maximize is grayed out. HOw can I get it to be full size?

I use Firefox.  After I posted my question, I noticed that the Home page I get does not match the one seen on the information page on how to navigate the home page.  The section at bottom left where one can select last version used is not there.  Instead, an enhancement example that was made to one of my photos is in that spot.