Thanks for providing the details about the concern, @Mark1117. Let me help you correct your beginning balance in QuickBooks Online (QBO).
To correct the beginning balance, you can manually reconcile the transaction that wasn't deleted by going to your account register.
- Go to the Gear icon and click Chart of Accounts.
- Search for the account where the transaction is assigned. Click the View register.
- Choose the transaction to expand the view.
- Go to the check column, and continuously hit the box until you see R (reconciled).
- Then, hit Save.
Additionally, here are helpful articles you can read about handling bank reconciliation in QuickBooks Online:
Let me know if you have other concerns about reconciliation concerns. I'm always here to help you out. Have a great day.