Hopefully this saves someone the two hours I spent on the phone with Intuit.
If the customer display name is showing on printed or emailed invoices above the Bill To box, this is now a reported glitch and it should not be doing that. There is now a service ticket with engineering to get it off. Lord knows how long.
You cannot remove it in the settings or customization.
Unrelated but similar, if your logo isn’t showing up when you go to make new templates bit it’s part of your account settings and is on other invoices, it’s not you. That’s not working either.