I’d like to know this, too as we have free gifts that are appearing in the Klaviyo product feed list but are hidden from my search on the site. 

hopefully someone can answer this 

Hey ​@Talalio 

you will have to write conditions in your dynamic block

refer to this similar question on how to do this

Exclude products from abandoned cart emails

you will have to customize the code snippet based on the name of the product you want to exclude.

I hope this helps and thank you for sharing your question here in the community.

Cheers

Arpit