ISE
Undoing and Redoing Actions
You can use the Undo command to undo the last edit performed. To reverse the Undo command, use the Redo command. You can undo and redo edits one at a time, from the time the file was last opened or saved.
To Undo or Redo an Action
  •  To undo an action, select Edit > Undo, or click the Undo toolbar button Image.
  •  To redo an action, select Edit > Redo, or click the Redo toolbar button Image.

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