You can undo recent changes then redo them if you want them back.
Undo the last action: Choose Edit > Undo (from the Edit menu at the top of your screen), or press Command-Z on your keyboard.
Redo the last action you undid: Choose Edit > Redo (from the Edit menu at the top of your screen), or press
+ + on your keyboard.You can also view and restore past versions of your documents if you want to delete all the changes you made since you opened a document, or revert to some specific version.