Calibre-server book format order

Is there a tweak or setting to select which book format format is assigned to the [Get] if a title has more than one format?

I have AZW3 books, EPUB books, and some books with both formats

For multi-format book titles, I'd prefer EPUB format for the primary choice for [Get]. It seems like AZW3 are the [Get] choice and EPUB is under Other Formats, but I couldn't find a setting

Sort of related question: what is the Books sort (seems the same as Title) and what is the Cover sort?