Hi there, Clarks.

I appreciate you giving us feedback with your experience about editing customers information. Let me help share more information about this feature.

In QuickBooks Online, there are times that the customer will be bill on the other address. This is the reason, that even if you’ve set up a customer address on their profile, you still have the option to edit it on the actual invoice. Since not all the time that the customer will be bill on the same address.

For more information about this feature, here's a great resource that you can read: Edit customer informationEdit customer information.

If you have any other questions, please let me know. I'd be happy to answer any questions you may have.