Hi serviziweb,
Thanks for details.
There are 3 default tabs of WooCommerce:
+ The Additional Information Tab: Shows when the Attributes are added under a Product. If the Attributes are not added then the Additional Information tab doesn’t show.
+ Description Tab: This is the main description on the product page.
+ Reviews: Used to show customers’s reviews.
You can read more here https://woocommerce.com/document/editing-product-data-tabs/
You are using Custom Single Product layout, which is built with WoodMart WooCommerce builder. Navigate to Layouts > Layout to edit Single product layout and use Product tabs
widget to display description.
Further, you can read more about the Layout Builder here: https://xtemos.com/docs-topic/woodmart-woocommerce-layout-builder/
Regards,