So I noticed a (new?) Help Menu in the top right and figured I would check it out. Briefly looked at it, and realized that I had no way to close the window. After some searching, I found a tiny portion of what i assumed to be the Close button at the bottom of the window and was able to close it. Playing around with Client Size can make it even easier/harder to see. I had my client in the default size when I first opened the menu.