This command sorts all opened documents to a cascade.
Window > Tile Horizontally
Covers the available area by tiles of all opened images. The images are ordered to columns which, in some cases, cause horizontal orientation of the image windows.
Window > Tile Vertically
Covers the available area by tiles of all opened images. The images are ordered to rows which, in some cases, cause vertical orientation of the image windows.
Window > [Opened file]
This command brings the selected image into focus (makes it active).