I don’t see a way to remove “PART X” from the top of chapters in the compile dialog. It seems like a weird thing to include in the first place because I’ve never in my life read a book that started chapters with “PART ONE”
Chapter 1, sure, but never PART ONE.

Just click the Section Layout button, and you’ll be able to remove or alter it. If you’re just getting started with this compilation, I’d suggest that you select some other preset than “novel with parts” if you didn’t organize your binder into part folders with chapters within it. It’ll be easier to get to where you want if your compile settings start out closer to what you’re trying to accomplish.
Thanks! I thought I had clicked on that but I guess not.