How do parts look in my exported PDF, ebook and Word file?

From version 1.9.24, every export shows the parts. In the PDF, each part has a page of its own with its title and its few lines of introduction, without a page number; with "Start chapters on a right-hand page (print)" ticked in Book design, the part page is on a right-hand page too. The contents page lists each part in bold with its chapters under it. The EPUB has a part page and nested contents (the part, then its chapters). The Kindle (AZW3) file has a part page and a contents entry for it. The Word (DOCX) file starts each part on a new page as a top-level heading, and Markdown has a "# Part I: The Ranch" heading. A book without parts exports exactly as before.