I understand that you're interested in customizing the branding within QuickBooks Advanced. Currently, the branding on outbound emails and approval screens is part of the system's default setup, account636.
It is not possible to fully remove QuickBooks or Intuit branding from system-generated communications, such as outbound emails and approval screens, in any QuickBooks Online subscription, including QuickBooks Advanced.
The default branding, such as footers and email domain links, is embedded into email templates and system pages and cannot be removed, even with premium plans. However, QuickBooks Advanced does offer customization options for sales forms, allowing you to edit logos, fonts, colors, and email messages. To achieve complete control over your branding, you can download these forms as PDFs and send them via your own email client.
If you have further questions about your subscription, feel free to leave a comment below.