Hi @ntokozodev,
You can stop certain products from being synced or make them hidden on your Facebook catalog by setting the product’s Facebook data to “Do not sync” or “Sync and hide in catalog” respectively.
See: Facebook product data documentation.
Moving forward, I understand how frustrating it is not to be able to get an extension to work as you need. We’re here to assist you and all you have to do is create a support thread or ticket when you need assistance.
As this is a review, we won’t be able to answer subsequent support questions. Please create a thread or open a ticket if you need further assistance.