Why did my book get more pages when I made the text bigger?

Bigger text means fewer words on each page, so the same book needs more pages. From version 1.9.22, the text size picker on the book's page (Book design, Text size) shows the estimated page count at once, and how many more pages than at the design's usual size. More pages cost more to print. For large print, a bigger trim such as 7 x 10 or 8.5 x 11 inches holds more words per page: BookyAI offers these trims, with their page counts, when your book is set in large print on a smaller page.