@CharleneMaeF 

RE: It's our goal to provide a user-friendly experience, JDJTOWING. 

Are you sure? It seems unlikely given how un-user-friendly QuickBooks Online is. And it's getting worse with almost every new update. Who in their right mind would prevent customers from assigning the document numbers to invoices as they please? There is literally no reason under the sun for such a restriction.

RE: Rest assured that we value your perspective on this matter, as it enables us to identify areas for improvement.

This isn't an "area for improvement".  It's a specific thing you broke by doing the complete opposite - by adding an unwanted, useless restriction where none is needed.

RE: While this feature is still unavailable in the new invoice layout,

It's not a "feature". It's a normal thing you have purposefully written code to exclude. All you have to do is comment out the unwanted code and then it'll work properly. Like with QuickBooks Desktop, for example.

RE: please know that our software engineers regularly review customer requests to enhance the program.

Do you really believe that? If so, I have a great investment opportunity for you. I bought this bridge, and just need a little more money from investors to build the toll booths. If you invest now, you'll be in on the ground floor.  If interested, call 8 6 7 - 5 3 0 9 and ask for Jenny.