Hi celalygc,
Thanks for reaching to us.
This demo is using a custom layout for a single product page. Navigate to Layouts > Edit single product layout with the page builder which you are using and edit this section.
Navigate to Layouts > Edit Checkout Layout and add more widget if you want.
Further, you can read more about the Layout Builder here: https://xtemos.com/docs-topic/woodmart-woocommerce-layout-builder/
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.
Best Regards,