How to Hide the "Beslist XML" Admin Menu

function plt_hide_beslist_xml_feed_voor_woocommerce_menus() {
	//Hide the "Settings → Beslist XML" menu.
	remove_submenu_page('options-general.php', 'beslist-feeds-xml');
}

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

Where do I put this code?