Unfortunately CookBook is intended just for storing your recipes on your app and creating your own personal CookBook, not as a physical cookbook creation tool.
You do have the ability to print all of your own recipes into a .PDF format which you could then make into your own cookbook for personal use.
You can also bulk export your recipes into HTML format inside a zip. Whilst these are not formatted for print, you might be able to print them into a single document on your PC, format them in a way you would like and get them printed into a physical CookBook.
Please be mindful of copyright, never claim a recipe as your own or reproduce it if it is not yours.
Find out how to bulk export here.
Can I make and print a physical cookbook from the recipes in my CookBook app?
