How to Hide the "ITP Cookie Saver" Admin Menu

function plt_hide_itp_cookie_saver_menus() {
	//Hide the "Settings → ITP Cookie Saver" menu.
	remove_submenu_page('options-general.php', 'nsc_ics_settings');
}

add_action('admin_menu', 'plt_hide_itp_cookie_saver_menus', 11);

Where do I put this code?