Disable WooCommerce 3.+ lightbox

disbale-woocommerce-3-lightbox.php

<?php // Do not include this if already open! Code goes in theme functions.php.

add_action( 'after_setup_theme', 'remove_wc_gallery_lightbox', 100 );

function remove_wc_gallery_lightbox() { 
  remove_theme_support( 'wc-product-gallery-lightbox' );
}

when I put it at the bottom, I get this message:

Your PHP code changes were rolled back due to an error on line 908 of file wp-content/themes/Holly_Theme/functions.php. Please fix and try saving again.

syntax error, unexpected '<', expecting end of file

Add only:

add_action( 'after_setup_theme', 'remove_wc_gallery_lightbox', 100 );
function remove_wc_gallery_lightbox() {
remove_theme_support( 'wc-product-gallery-lightbox' );
}