Authors, what are common trim sizes for nonfiction in the USA?

What are the nonfiction genre page sizes used in the USA? Can that size be set in Scrivener so one is composing in publishing size ? For example, I’ve been using nonfiction template, size 8.5 x11”, but when compiled to 6x9” . What a distortion that caused!

You can set whatever page size you want in Scrivener. See Section 16.1 in the manual for information about the Editor page size, Section 24.20.3 for the Compiled page size.