The product names/titles in the shop, related product and up/cross-sell modules use H2, to change this, add the following script to the Divi Integrations head.

Note: this doesn’t work correctly in combination with the “Themify – WooCommerce Product Filter” plugin. After a search, the titles revert back to h2.

<script>
jQuery(document).ready(function() {
jQuery(".woocommerce-loop-product__title").replaceWith(function()
{
return '<h3>' + jQuery(this).text() + '</h3>';
});
});
</script>Code language: HTML, XML (xml)