

In order to add a section, you need to go to Customizer → Add Section → Products thumbnails.

Heading - section heading;

Container width - a container width of the section. If the “Inherit” value is selected then the container width is based on the group 'Layout' settings in the Theme settings;
Desktop offset top - top indent of the section on the desktop;
Desktop offset bottom - bottom indent of the section on the desktop;
Mobile offset top - top indent of the section on the mobile;
Mobile offset bottom - bottom indent of the section on the mobile.

Heading - the setting is responsible for the tab’s button text;
Products - the setting is responsible for products in the tab. Limit: 4 products.
Button label - allows you to set the text for the button below the products

4. Button link - allows you to set a URL for the button;