3 euro duty, when applied?

Where does this 3 euro per item come into play. I just “tested” it by putting something from my cart to checkout and the only added was the standard shipping.

It didnt say anywhere about an extra fee even though i presume its supposed to let me know if im paying a “hidden fee” or when i will need to do that.

So anyone with recent orders, where does this come into play? When do you pay extra?