Undoing Changes
If you don’t want to save changes you made to your spreadsheet since opening it or
last saving it, you can undo them.
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 spreadsheet or reverting to the last saved version.
To restore changes you’ve undone using Edit > Undo, choose Edit > Redo one or
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more times.
To undo all changes you made since the last time you saved your spreadsheet, choose
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File > “Revert to Saved” and then click Revert.