I managed to figure out myself what the issue was. Following your instructions above was only half the process.
When entering a new invoice after deactivating online payments in the sales settings, you have to actually click on the online payment options within the invoice screen & deselect 'card and digital wallets' from the list, this will then save the preference for future invoices. I also needed to change this option in all of the 'recurring sales' that we have set up (which were many). Once I had done this, the online payment option disappeared from all new invoices following.
Maybe you can update the instructions to add this step? Or add a fix that syncs the online version preferences with the desktop version so that we don't have to do things twice?
