If you don’t want to keep the last changes you made, you can undo them.
Do either of the following:
To discard all the changes you made since the last time you saved your document, choose File > “Revert to Saved.”
To undo the last action, choose Edit > Undo.
You can do this multiple times to undo any changes you made since the last time you opened the application or reverted to its last saved version.
Note:You can’t undo any changes that have been published.