I agree with you, mcv5.

It would be great to revert an invoice to an estimate. That said, I'd suggest sharing this suggestion with our developer's team.

Here's how:

1. Click the Gear icon and select Feedback.
2. Enter your suggestion and click Next.

You can track feature requests through the QuickBooks Online Feature Requests website.

For estimate setup, function, and common questions, you may refer to this article: Create and send estimates in QuickBooks Online.

I'll be around whenever you have other concerns about invoices.