Hello there, @Kooroomboo.

We cannot customize a reconciliation report, but I want you to know that your voice matter to us. Rest assured that this will be forwarded to our product engineers to have this option in QuickBooks Online.

If you wanted to change or undo a reconciliation, you can manually unreconcile each transaction.

Here’s how.

1. Click Accounting, then go to Chart of Accounts.
2. Choose the bank account, then click View register.
3. Look for the transaction.
4. In the reconcile status column, choose the top line repeatedly to change the status C - Cleared, R - Reconciled, and Blank - Not cleared or reconciled.

Please know that you need to consult your accountant so you’ll be guided with the process.

Also, let me leave you an article that will help you if you need some information or procedure while using QuickBooks Online. Help article.

Please let me know if you have any other questions. I am here to help. Keep safe!