If your site doesn’t use comments and you want to remove their menu items from showing in the back end, this can be done in your functions.php file.

Place the following code anywhere in your child theme’s functions.php document.

// disable comments
add_action('admin_init', function () {
    // redirect any user trying to access comments page
    global $pagenow;
     
    if ($pagenow === 'edit-comments.php') {
        wp_safe_redirect(admin_url());
        exit;
    }
 
    // remove comments metabox from dashboard
    remove_meta_box('dashboard_recent_comments', 'dashboard', 'normal');
 
    // disable support for comments and trackbacks in post types
    foreach (get_post_types() as $post_type) {
        if (post_type_supports($post_type, 'comments')) {
            remove_post_type_support($post_type, 'comments');
            remove_post_type_support($post_type, 'trackbacks');
        }
    }
});
 
// close comments on the front-end
add_filter('comments_open', '__return_false', 20, 2);
add_filter('pings_open', '__return_false', 20, 2);
 
// hide existing comments
add_filter('comments_array', '__return_empty_array', 10, 2);
 
// remove comments page in menu
add_action('admin_menu', function () {
    remove_menu_page('edit-comments.php');
});
 
// remove comments links from admin bar
add_action('init', function () {
    if (is_admin_bar_showing()) {
        remove_action('admin_bar_menu', 'wp_admin_bar_comments_menu', 60);
    }
});