I would gladly help you undo bank reconciliation in QuickBooks Online, @Dash27.

When undoing bank reconciliation, you have the option to manually unreconciled each transaction without involving your accountant. However, it's still best to consult one, for they understand the cause and effect of doing the process. This is to ensure also that your book will not be messed up. 

To unreconcile a transaction, here's how:

1. Select the Accounting menu.
2. Choose Chart of Accounts.
3. Find the account holding the transaction and then click View register. 
4. Choose the transaction you want to unreconcile to expand the view.
5. Review the check column and if the transaction is reconciled, you’ll see an “R.”
6. Click the checkbox. Keep selecting it until the box is blank. This removes the transaction from the reconciliation.
7. Once done click Save and close the account register.

After unreconciling, you can reconcile the transactions again. You can also check this resource to guide you on how to handle reconciliation: Learn the reconcile workflow in QuickBooks.

If you have other concerns about QuickBooks, let me know by commenting below. I'm just one post away. Have a safe and productive rest of your day!