You can use this constant to disable the Novelist ‘book’ archive. This is a good idea if you want to use the [novelist-books] shortcode to create your own archive page.
Add this code to your theme’s functions.php file (or to a new plugin file) to disable the archive:
define( 'NOVELIST_DISABLE_ARCHIVE', true );
Then, go to Settings > Permalinks and re-save your permalinks.