You can search the recipes in a book using any Bookmark as a filter. You do need to be on your Bookshelf rather than the Library. Access the Recipes tab on your Bookshelf. Enter the book title in the search box - putting the title in quotes will improve the accuracy e.g. "660 Curries". Then use the bookmark filters on the right, selecting "I've Cooked This" from Recipe Bookmarks.
A search filter is different to a sort. A Sort orders all the recipe search results according the criteria selected - A-Z, ratings, date, etc. A Bookmark filter shows only search results that match the selected Bookmark.