How to Hide the "Tagging (GTM Server Side)" Admin Menu

function plt_hide_tagging_menus() {
	//Hide the "Settings → Tagging (GTM Server Side)" menu.
	remove_submenu_page('options-general.php', 'tagging_settings');
}

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

Where do I put this code?