How to Hide the "REST XML-RPC Data Checker" Admin Menu

function plt_hide_rest_xmlrpc_data_checker_menus() {
	//Hide the "Settings → REST XML-RPC Data Checker" menu.
	remove_submenu_page('options-general.php', 'rest_xmlrpc_data_checker_settings');
}

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

Where do I put this code?