Puzzle window misbehaving

I recently had my puzzle window turn completely gray. After some panicking, and moving things around, it seems that it is the bottom section that holds the Control bar (Library/Puzzles, Min/Max Toolbox, Show/Hide Viewport, etc) that had grown to cover the entire window. When I resized the window as small as it could go and then stretched it back out, I could see part of the actual puzzle workspace (see attached).

I can use it like this but is there something I can do to reset the bottom Control bar? I restarted the app manager and even restarted the computer and it didn’t change anything.