With code you will be able to change the default thumbnail of WooFood QuickView .
Copy and paste the following code snippet to your functions.php on your child theme.
add_filter('woofood_quickview_image_size', 'wpslash_change_quickview_image_hook', 10, 1);
function wpslash_change_quickview_image_hook($default)
{
return 'full';
}