Code to Disable “User Sitemap” in WordPress

/* Disable Users Sitemap WordPress */
function wpflt_disable_sitemap_users($provider, $name) {	
	return ($name == 'users') ? false : $provider;
}
add_filter('wp_sitemaps_add_provider', 'wpflt_disable_sitemap_users', 10, 2);

To disable User URLs from WordPress default Sitemap.xml, add this code to child theme’s functions.php

Search Engines do not rely on Sitemaps. They can discover all pages that are accessible to public.