Phonics Launch books do not have levels, but they have been carefully aligned with a phonics Scope and Sequence. This is available for each book on the Phonics Launch bookshelf. For more on selecting a book from the bookshelf, see Navigating the Phonics Launch Bookshelf.
Once you have selected a book, select the Tools icon from the side rail. This looks like a piece of paper with a down arrow on it. There, you can select the Scope and Sequence for that book's set.