@rawn77 is correct. It is not doing it that way with new orders. I order 4-29 and have filled out everything and submitted and it still has "edit design" available. There is somethin strange going on with the orders placed for the new "refreshed" models and the My Tesla page and build / delivery process....….
I ordered a refreshed model s on 4/23. Are you sure you're talking about the second submit button after you order? It doesn't even appear until you complete each step.