This seems like a really simple problem, so forgive my obtuseness in advance:
Forms seem to be a mess in UCI.
Hosted D365 updated for UCI. As I review forms, things that used to live in a single-page view are now broken into tabs. Most of these were/are subgrids. It doesn't appear that I can modify things in a way that prevents breaking things into tabs. This is frustrating, as we have required fields that used to live on a single page which now require toggling to a separate tab to complete before the system allows a Save.
Example:
Production form from "Order" Entity:
Same form in Dev, post-UCI:
When I look at the form in the classic editor, it's no different post-UCI than it was in the legacy app: