Hi HARSLE,

Thanks for reaching to us and take our apologies for the long delay in answering.

This demo using Custom WooCommerce Builder layouts, which is part of WooCommerce builder from WoodMart.

Here below are the documentation articles:
https://xtemos.com/docs-topic/woodmart-woocommerce-layout-builder/
https://xtemos.com/docs-topic/single-product-page-builder/

Regards,