Search Content Type Refiner, hide OOB types e.g. Item

I have a farm with 20 content types created in the CT Hub.

When I add SPContentType to the Refinement Panel in the Search Center, this refiner returns my 20 content types and other types like, Document, Item, Article Page, Folder, etc.

Is there any way to hide; Document, Item, Article Page, Folder and other OOB content types?