Properties should not be able to be dragged into the wrong criteria.
When a marketer creates a new segment, the contributor area should be empty (all the contributors empty).
When a marketer pick up a field and wants to add it, when you drag the area highlights, when you drop the contributor shows up.
When a marketer pick up a field, if there are several contributors, the editor should display the areas who the marketer can't drop it disabled.
When a marketer pick up a field of a contributor that was created before, the editor should disable the other contributors.
Take into account that the contributors can create groups of fields with conjunction (to highlight the area).
Figma designs in parent issue.