How do I make the text of my book bigger, or print it in large print?

From version 1.9.22, every book design has a text size. On the book's page, find Book design and, under it, Text size. Choose Standard, Larger (13 pt), Large print (16 pt) or Extra large (18 pt), or set any size in between with the slider. A page drawn to scale shows the result, with the estimated page count. In New Book, the same choice is in "Print & text size", and when your target audience is seniors or readers with low vision, BookyAI suggests large print. The size applies to the printed book (PDF and Word); ebook readers choose their own size.