Thank you for tending to this thread and answering the question posed.  I would suggest you get rid of the PO information from the original answer because it does not address the current version of QB desktop for MAC.  Neither does the article recommended that was giving advice on 2020 versions.

Your solution worked and I can happily move on. I changed the check payment information to the vendor. This required a rebuild of the data but payment came out of correct reconciled bank account and there's a zero balance on the AP account for the vendor.  Thank you, Jovelyn.