I have found the only way around this is to click the add/edit button then add the new one to override the saved account.

However, as of late March or early April 2022, the bank info field no longer shows in the Customer Edit screen under "Payments" tab when you select the QuickBooks Bank Payment option. You can create a Receive Payment & enter the banking info there then click the box to save for future use and the delete the payment w/o processing, unless you need to pay it.  Hope this helps!