Adobe suite 5 for mac. I always thought the F4 key was used to Repeat the last command, and the keyboard shortcut Ctrl+Y was used to activate the Redo command. I don’t use Redo very much, but the keyboard shortcut Ctrl+Z for the Undo command is one of my favorites. Toolbar icons for Undo and Redo command are common, yet I found there’s a toolbar icon for the Repeat command (Windows only). Adding the Repeat icon to the Quick Access Toolbar is a simple way to distinguish what commands can be repeated. The Repeat icon will be grayed-out if the current command can’t be repeated. It becomes active and has color (as shown above) when the current command can be repeated. After there’s been an Undo action, the Repeat icon will change to a Redo icon.

Command-Tilde (~) will step through your open document windows in whatever application is currently in front; Word, Photoshop, BBEdit, or any other. Command-Shift-Tilde will cycle through the windows in reverse order. (Command-Tab steps through the current open applications, not documents. The Undo the last action command shortcut in Word 2016 for Mac are Command + Z, Control + Z and F1. Since you have tried the previous two command shortcuts, please try pressing F1 to see if it makes any changes.