Hi there,
the CSS is simple enough:
.single-product .product_meta .posted_in a {
display: block;
}
However the ,
separator cannot be removed easily using CSS without removing the word Categorías
as well.
To remove the comma you would need to copy this template to your child theme:
https://github.com/woocommerce/woocommerce/blob/7701d4b57cb20dc89e25bb7bf2ff872d85f4c535/templates/single-product/meta.php#L34
And on Line 34 that i have highlighted change it to:
<?php echo wc_get_product_category_list( $product->get_id(), '', '<span class="posted_in">' . _n( 'Category:', 'Categories:', count( $product->get_category_ids() ), 'woocommerce' ) . ' ', '</span>' ); ?>