Thumbnails per Row Product Gallery WooCommerce
add_filter( 'woocommerce_single_product_image_gallery_classes', 'bbloomer_5_columns_product_gallery' );function bbloomer_5_columns_product_gallery( $wrapper_classes ) {$columns = 5; // change this to 2, 3, 5, etc. Default is 4.$wrapper_classes[2] = 'woocommerce-product-gallery--columns-' . absint( $columns );return $wrapper_classes;}