Variation Swatch only for Particular Category of Products

Hi La Demeure,

Unfortunately, the feature is not currently available.

​But it’s a great idea. I’ll discuss this feature with my team.

In the meantime, please send the feature request here: https://storepress.fider.io/
and ask your other to upvote it.

BTW, you can try the below snippet using the Code snippets plugin–

add_filter('default_woo_variation_swatches_single_product_dropdown_html', function($default){
   global $post;
   //Add your category id's here. For example: [17,25]
   $cats = [17];
   $terms = get_the_terms( $post->ID, 'product_cat' );
   foreach ($terms as $term) {
      $product_cat_id = $term->term_id;
      break;
   }
   if ( is_product() && in_array($product_cat_id, $cats) ) {
      return true;
   }
   return $default;
}, 10, 1);

Cheers!