Reconcile
How to unreconcile all accounts all at once
How to unreconcile all accounts all at once
Thanks for using QuickBooks Online (QBO), @andiie46. I have all the steps to help you undo your reconciliation.
You can undo a reconciled transaction individually. If you need to start over, I'd suggest reaching out to your accountant so they can undo the entire period at once using QuickBooks Online Accountant.
All you have to do is invite them first. Here's how:

If you want to do it manually, follow these steps to undo reconciled transactions one at a time:

I've added this article in case you encounter reconciling issues in the future: Fix issues at the end of a reconciliation in QuickBooks Online.
If you want hands-on help with managing your finances, you can partner with our QuickBooks Live Expert Assisted team. They offer advice that meets your business needs.
Come and visit us again if you have more questions about unreconciling your transactions. You can click the reply button below and I'd be glad to provide the necessary help.
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