Hello there, @Maikelis.
I'd also feel ignored if left with no resolution. However, the feature is only available if you're using the QuickBooks Online Accountant (QBOA) version.
You can only unreconcile a single transaction in QuickBooks Online (QBO). I know how important it is to have an undo option for your entire reconciliation for a specific period. This will surely speed up your work to finish your task in no time. With that said, here are a couple of workarounds you can perform to unreconcile your transactions.
First off, you can manually undo the reconciliation by editing them. Another option is to ask your accountant to undo the reconciliation on your account. Additionally, you can also sign up for QBOA to use this feature.
Also, QBO automatically generates a report so you can check your previous reconciliation data. This includes information such as the beginning and ending balances as well as those transactions left uncleared.
You're always welcome to post again here and ask any other questions about managing your reconciliation. I'm always ready to lend you a hand.
