Logic Pro X Main Window - does not shrink enough


I come across something a bit odd. I imported a project from LP9. In LP9 I had a number of different screens set up. One of those had 4 windows open, the Main (Arrange), Mixer, Score and Piano Roll. All were of equal size and divided my screen in quarters. When I import, (or rebuild from scratch) the Main (Arrange) window does not shrink down past a certain size, about 40% (more or less) of my entire iMac screen rather than down to 25%. Not an overwhelming problem but, an irritant as I like the 4 window view. Has anyone else had this issue or wants to offer a solution?

Overall, I quite like LPX, but I am suffering through the learning curve.