Overview article rating per blog post

@greg_pl,

You can use the custom code below to show the article rating in the post list: 

add_filter('manage_post_posts_columns', function($columns) {
        return array_merge($columns, ['wpd_rating' => __('Rating', 'wpdiscuz')]);
    });
    add_action('manage_post_posts_custom_column', function($column_key, $post_id) {
        if ($column_key === 'wpd_rating') {
            $rating = get_post_meta($post_id, 'wpdiscuz_post_rating', true);
            if ($rating) {
                echo $rating;
            } else {
                echo 0;
            }
        }
    }, 999, 2);
    add_filter('manage_edit-post_sortable_columns', function($columns) {
        $columns['wpd_rating'] = 'wpd_rating';
        return $columns;
    });

Important: The code doesn't support the code ordering by post rating. 

Put this code in the WordPress active theme functions.php file (more information on how to add insert custom code).