Hi there, DW82.
Let me provide more information about using custom form styles in QuickBooks Online (QBO).
Once you edit the name of the estimate template, it will only reflect when you print the estimate; it won't affect the Estimate page. That said, the Custom Form Style feature only allows you to customize the template for what you want to show when you email the sales form to your customer.
I'll add this article to help you learn more about customizing templates in QBO: Customise invoices, estimates, and sales receipts in QuickBooks.
You can always refer back to this post if you have further questions. I’m here to help.
