Does anyone know how to unreconile a full month on a bank account?

Welcome to the Community forum, @carole26.

Let me provide the steps on how to undo the reconciliation of your full month's worth of bank transactions.

We can undo reconciled transactions manually and in batches. However, the in-batch option is only available for QuickBooks Online Accountants and not for regular QuickBooks Online (QBO) users.

You can read this article for more info: Undo a client’s reconciliation in QuickBooks Online Accountant.

With that in mind, you need to reach out to your accountant if you want to undo reconciliation one time. On the other hand, you can manually unreconcile transactions in QBO from the Chart of Accounts (COA) section.

Here's how:

1. Select the Chart of account from the Transactions tab.
2. Pick Account history and look for the account holding the transaction.
3. Choose the transaction you want to undo reconciliation to expand the view.
4. In the check column, change the "R"  to no sign to undo reconciliation by clicking it until nothing shows.
5. Click Save.
6. After that, close the account history.

Check out this article for more info: Undo or remove transactions from reconciliations in QuickBooks Online.

If you want to track the money that moved in and out of your bank account, feel free to read this article: Use reports to track cash flow in QuickBooks Online.

Never hesitate to come back here if you have additional questions about managing your reconciled transactions. We'll be willing to help. Take care, and enjoy the rest of the week.