function start_rite_menus() {
    register_nav_menus(array(
        'primary-menu' => 'Primary Desktop Menu',
        'mobile-menu'  => 'Mobile Menu'
    ));
}
add_action('init', 'start_rite_menus');
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://www.startriteschool.com/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://www.startriteschool.com/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://www.startriteschool.com/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://www.startriteschool.com/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://www.startriteschool.com/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>