I appreciate you for trying the steps shared by my colleague, gvernon-pacific-.

With the new update, any changes made to a sales form will reflect in the others. That said, I'd suggest sharing feedback with our Developers about this one.

You can click this link to post your insights: Customer Feedback.

Feel free to browse this article on how you can customize the look of your sales forms:  Customize invoices, estimates, and sales receipts.

I'm always around to help with any of your concerns.