Exclude custom post_type in sitemap generation?

If you need a filter solution:

add_filter( 'wpseo_sitemap_exclude_post_type', 'your_prefix_exclude_cpt_from_sitemap', 10, 2 );

function your_prefix_exclude_cpt_from_sitemap( $value, $post_type ) {
    $post_types_to_exclude = [
        'post_type_one',
        'post_type_two'
    ];
    
    if ( in_array($post_type, $post_types_to_exclude) ) {
        return true;
    }
}

You can use the "post_types_to_exclude" array to define multiple post types you want to exclude from the sitemap.

This question has been asked a long time ago, but the answer is kind of simple:

• Go to SEO --> Search Appearance.
• Select tab Contenttypes.
• Scroll down, here you can display or hide custom post types and archives from the sitemap.xml file.

Hope that helps for someone.

If you are using functions.php script to register custom post type, you should declare false to 'has_archive' => true,.

function custom_post_type() {

  $labels = array( ... );
  $args = array(

    // you have to set it to False.
    'has_archive' => false,

  );
  register_post_type( 'post_type', $args );

}
add_action( 'init', 'custom_post_type', 0 );