function plt_hide_better_wp_security_menus() {
//Hide the "Security" menu.
remove_menu_page('itsec');
//Hide the "Security → Setup" menu.
remove_submenu_page('itsec', 'itsec');
//Hide the "Security → Get More Security" menu.
remove_submenu_page('itsec', 'itsec-go-pro');
}
add_action('admin_menu', 'plt_hide_better_wp_security_menus', 11);