Glad you reached out to us regarding your reconciliation in QBO, @simplykinteriors.
I can help share some insights and steps to help you un-reconcile an account.
To do this, you need to undo the reconciliation manually and reconcile it again. Please note that modifying reconciliation status will affect past and future reconciliations.
Use the steps below to manually undo a reconciliation:
Click the Accounting menu, then choose Chart of Accounts.
Find the account you want to review.
From the Action column, click Account history.
Locate the entries from the list and make sure the status column (indicated by a checkmark) shows a code R (Reconciled).
Click that field repeatedly until blank. A Blank field means the entry is neither cleared or reconciled.
For additional information about the best practices when reconciling, see this article: Reconcile Hub.