Hello, @TheOne,
Actually, the code that we shared with you will show the tabs like this: https://postimg.cc/Y4jb0Pq4 it will not make the tabs as a slider. If the code is not showing like this on your site then please share your site wp-admin URL and access in the private content area of this topic by following the below-given format
WORDPRESS ADMIN URL:
WORDPRESS ADMIN USERNAME:
WORDPRESS ADMIN PASSWORD:
So that I will check and fix your issue on your site.
Regards 8Themes Team.