How do the "at least/at most, minimum/maximum collaborators" filters work?

If you filter by the decision "Included" and "at most 2 collaborators," this will show you all articles that are included by 2, 1 or no collaborators at all. You can apply this for any decision and reverse it "at least 1", and so on. 

This is helpful if you want to work on articles that are for example included/excluded by at most 0 collaborators, i.e. never touched.