Since you cannot print directly from the Bank Register, you will need to use the built-in ACCOUNT QUICK REPORT from the Chart of Accounts. You will get the same information as you would see on the Bank Register.
From the home page screen
Select the Company Gear (upper right corner)
Select Chart of Accounts under Settings heading
Highlight the bank account your want to print
Click Report blue button
You can customize the report more by clicking Customize button and also change Transaction Date if needed.
QuickBooks Online doesn’t have an Undo Last Reconciliation feature. To unreconcile a reconciliation you’ll need to unreconcile each transaction via the register.
To access and print a previous reconciliation report:
From the gear icon go to Reconcile.
Choose the account from the drop-down list.
Click on the desired reconciliation report.
Once the report is open, click Print.
To undo a reconciliation:
Select Transactions on the left menu then Registers.
Click on the account then click Go to Register
Find the transactions that need to be unreconciled, one at a time.
To highlight click on the transaction.
Click on the R on the top line of the transaction, which is between the Payment and Deposit or Charge and Payment amount. Clicking in this field will allow you to change the status of the transaction to the desired status from blank = unreconciled to C = Cleared.
Click on Save.
A message will appear: This transaction has already been reconciled. You should only remove the R if you’re correcting a mistake. Are you sure you want to remove the R? click Yes.
Continue this process for each transaction on the reconciliation report or statement you want to unreconcile.