Giving Photoshop for Mac a gray background like on Windows

Having recently moved from Windows to Mac, the transparent application background in Photoshop for Mac is driving me a little bit bananas. Is there a way to give the application itself a gray background like it has in Windows?

All of my searches on this topic come back with tutorials on how to add a gray background to a Photoshop file, not the application itself.


Window Menu > Application Frame