How to remove the gray background in Photoshop on Windows?

[djmatt21]

I understand that when you have a Mac and use Photoshop you do not have the gray background behind your project windows. What you see instead of gray is your background. Is it possible to do this on windows? How? I know pressing F on your keyboard gives you new modes but I have the mode where each project has its own window.. Help?

 

[Bobdarshy]

Personally, I drag the bottom of the window up until I can only see part of it in case I minimize an image.