To safely undo a QuickBooks Online reconciliation without losing data, follow these steps:

1. Navigate to the Gear Icon and select "Reconcile".
2. Find the reconciliation you wish to undo.
3. Click on the "Undo" button next to the reconciliation.
4. Confirm the action by selecting "Yes" when prompted.

This will reverse the reconciliation, but your transactions will remain intact, allowing you to make necessary adjustments without losing any data. Always review the details before finalizing any changes.

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