When you’re working in a dialog, sometimes you may mess up the settings so much that you’d prefer to start over again. You could click the Cancel button and try again, or you could click the hidden Reset button and carry on working with the initial settings when you first opened the dialog. Where is this hidden Reset button? If you hold down the Option (PC: Alt) key, the Cancel button will turn into a Reset button. Click it and you’re good to go. 

This tip previously published in Colin Smith’s Photoshop Tips column, in the January, 2017 issue of Photoshop User magazine.