see http://blog.speksnijder.com/collecties/

I do not have 1 specific blog page. I want to use blog items on several pages.
For instance page domain.com/subject a
Lay-out builder item Blog Posts
Category ‘subject a’ selected

The issue is that if ‘subject a’ is a parent category with subcategories under it, the page also loads all sub items.
Obviously what I want is that only the selected category is visible, without the subitems.