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Let me walk you through how you can undo the reconciliation, @FEC20.
There are two options to undo reconciliation in QuickBooks Online. The first option would be to open the register and double click on the R to remove it, one transaction at a time.
To do this, you can follow this guide:
The second option would be needing help from an accountant who signs in to your QBO account to have him used the accountant tool to undo a month of reconciliation.
For your reference, you can also check out this article for further guidance: How to undo a reconciliation.
I've added a couple of references below that'll help you handle your account's reconciliation in the future:
Please let me know if I can be of further assistance. I'm always here to lend you a hand. Take care, and have a nice day ahead!