I appreciate you sharing the option that you'd like on the email layout your customers received when sending an invoice. I'm happy to help sort this out.
I'll be sure to pass along your request to see more customization within the program for the email layout you sent to your respective customers. I would also like to invite you to leave feedback for the Product Development Team and let them know about the changes you'd like to see. This can be done directly through your account by clicking the Gear icon in the top right corner, then selecting Feedback or by going to the following link: https://feedback.qbo.intuit.com/. Please know that I'm going to submit your request on my side as well.
QuickBooks Online is constantly changing and evolving based largely on the suggestions and requests of users, like yourself.
That's it! Thanks for being a part of our QuickBooks family. Please let me know if I can be of additional assistance by leaving a comment. Have a great weekend!