You can choose Undo and Redo multiple times.
To undo the previous action:
Choose Command ⌘+Z
or pressTo Redo an action that you have undone:
Choose Command ⌘+Shift ⇧+Z
or pressThe Revert command is dimmed if you haven't made any changes to the document.
Reverting to the last saved version of a document:
After making changes to a document, if you decide that you want to start over, you can revert to the last saved version of the document.
To revert to the last saved version of a document:
Choose