I'm here to make sure you're able to undo your reconciled account in QuickBooks Online, @smitty1.
The Undo option is only available in QuickBooks Online Accountant. To unreconcile bank reconciliation, you can manually unreconciled each transaction or let your accountant do it for you. However, it's still important to consult an Accountant. This is because they understand the cause and effect of undoing an entire reconciliation.
You can follow these steps on how to invite your accountant to your company: