It depends whether or not you use business policies @vilkau . If you do not use biz policies then follow the link provided by other posters. You'll see exclusion options both at the account level on the shipping preferences page and on the listing form. https://www.ebay.com/ship/prf
If you use biz policies then that info is accessed on each individual biz policy and you cannot make changes at the account level. To make changes at the listing level you'd have to use the edit link on the listing that says something like edit the policy for this listing only.
https://www.bizpolicy.ebay.com/businesspolicy/manage
