How to hide WooCommerce products from search by category

I found myself in the situation where I had to give the client the possibility to hide some of their products from search, so they can manually send the product urls to their clients. The way I got around it at the time was to create a product category called Hidden and use the snippet below, which you can paste in your theme’s functions.php file.

  Remove hidden category products from search
function wpharvest_pre_get_posts( $query ) {
   if ( ! is_admin() && $query->is_main_query() && $query->is_search() ) {
       $tax_query = array(
               'taxonomy' => 'product_cat',
               'field'   => 'slug',
               'terms'   => 'hidden',
               'operator' => 'NOT IN',
       $query->set( 'tax_query', $tax_query );
add_action( 'pre_get_posts', 'wpharvest_pre_get_posts' );

If you find this snippet helpful or need help with it, please leave a comment below.