Develop window behind gallery window, unusable

Hi Adobe friends,

I've used lightroom for years and I've never had this issue. When I open LR, this is what I see. I can't move it to see the normal develop / library window. When I click off the window onto another area of my Mac, I can see the window I want to use. How can I close the screenshotted window so I can access what's behind it? Even settings and whatnot open behind this. So strange. Help 🙂