Oooops, it’s using View.js, not Fancybox.
Try editing functions.php and changing line 141 so that it looks like this:
// wp_register_script('viewjs', get_template_directory_uri() . '/js/view.min.js?auto', 'jquery', TRUE);
Then, lower down:
// wp_enqueue_script('viewjs');
I’ve added // in front of it, so it would be commented out and not use View.js on images. Together with my previous suggestion, you should now be able to use a lightbox plugin yourself.
Note that this will need to be done again if you update the theme.
Regards,
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Cosmin
Support Assistant