function plt_hide_admin_user_search_menus() {
//Hide the "Users → Search Users" menu.
remove_submenu_page('users.php', 'search-users');
//Hide the "Users → Contact Us" menu.
remove_submenu_page('users.php', 'search-users-contact');
}
add_action('admin_menu', 'plt_hide_admin_user_search_menus', 1000000000);