The Window menu contains commands relating to the arranging of windows and supports methods to switch between canvas windows.
The New command opens new window that has same viewpoint to current active canvas window.
The cascade, tile vertically, and tile horizontal command arranges the windows such as following:
Arranges minimized canvas windows.
To switch between canvas windows, press Ctrl + Tab keys. If you want to go back, press Ctrl + Shift + Tab keys. If you press the above-mensioned keys, the switch window such as the below is poped. Then, if you want to select next canvas, press the Tab key.
The opend window under the Switch... command shows list of currently opened images. If you select one of them, switch to current active window.