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Mac: Cmd + Shift + W

Win: Ctrl + Shift + W

Note: Many of the following shortcuts list an F key. Some OS configurations may have reserved functionality for the F keys that supersede Photoshop's claim to the keys. For example, on a typical Macintosh laptop, you have to hold down the Fn (Function) key along with the desired Photoshop F key by default to get it to work. You may want to change the keyboard settings for your OS if that is the case for you.