Hello,
Thank you very much for choosing our theme and for contacting us.
In order to switch on/off the tabs you need fill in or clean the fields, so if you fill the full description out, you will have this tab, if you leave it empty it would not appear.
Next:
Additional information: if you have weight/ size you have this tab, remove the date and tab would disappear, also if you set showing attributes in the product page this tab appears.
Reviews are disabled in Woocommerce > Settings > Product tab
About Brand is disabled in the Theme Settings > Shop > Brands > Show tab with brand information. The brand content is created in HTML blocks and added to the attribute description https://xtemos.com/docs/woodmart/html-blocks-2/#cat_att_tag
Shipping Delivery: clean the fields in the Theme Settings > Product Page > Tabs, the content is created in the HTML blocks https://xtemos.com/docs/woodmart/html-blocks-2/#shipment_delivery
Best Regards