Only accountant users with QBOA can undo a reconciliation with the push of a button. You have to manually unreconcile each transaction https://quickbooks.intuit.com/community/Banking-and-bank-feeds/How-to-unreconcile-a-transaction-or-u...
You can ask your accountant user to undo a reconciliation for you. https://community.intuit.com/articles/1769993-undo-a-reconciliation-using-quickbooks-online-accounta...
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