After the book categories and books are added, you must create a new page on the site. So, click on the Add New option in the Pages menu of your dashboard.
Then, add the title of the page like ‘My Books’ there. Also, you must use a shortcode that displays the books on your page.
So, on the body section of the page, add [wp_books_gallery].
After which, click on the Publish button.
Note: The gallery page slug should not be ‘books’. You can use ‘my-books’ or ‘our-books’ etc