Undoing Changes
If you don’t want to save changes you made to your document since you opened or
last saved it, you can undo the changes.
Here are ways to undo changes:
To undo your most recent change, choose Edit > Undo.
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To undo multiple changes, choose Edit > Undo multiple times. You can undo any
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changes you made since opening the document or reverting to the last saved version.
To undo one or more Edit > Undo operations, choose Edit > Redo one or more times.
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To undo all changes you made since the last time you saved your document, choose
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File > “Revert to Saved,” and then click Revert.