How to Hide the "ATs Privacy Policy" Admin Menu

function plt_hide_ats_privacy_policy_menus() {
	//Hide the "Settings → ATs Privacy Policy" menu.
	remove_submenu_page('options-general.php', 'policy-ats.php');
}

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

Where do I put this code?