If you need to undo a reconciliation in QuickBooks Online, there is an easy way to do it. Here's how:
1. Go to the Gear icon > Tools > Account and Settings.
2. Select the Accounting tab and go to the Reconciliation section.
3. Find the reconciliation that you want to undo and click the Undo button.
4. Confirm that you want to undo the reconciliation by clicking Yes.
That's all there is to it! Undoing a reconciliation is quick and easy in QuickBooks Online.