What does "Large print" do?

The digits are 18 pt or more, and the page text is bigger too. The studio refuses to export a large print book if any grid's digits fall below 16 pt, so the book always keeps its large print promise. Between 16 and 18 pt it shows a note that 18 pt or more is recommended. If you see the message, put fewer puzzles on a page. The title page shows "Large print" in the book's language.