What do I need to publish a large print book on Amazon KDP?

KDP allows "Large Print" in a book's title or subtitle only when the text is at least 16 pt. From version 1.9.22, choose Large print (16 pt) or Extra large (18 pt) under Book design, Text size, on the book's page. BookyAI then sets the book the way low-vision readers find easiest: an even left edge without stretched gaps, no words split over two lines, and headings and page numbers grown with the text. Large print reads best on a bigger page, so BookyAI offers the 7 x 10 and 8.5 x 11 inch trims. "Ready to publish" on the book's page then reminds you to say "Large Print" in the title or subtitle. When you publish, also mark the paperback as large print on KDP.