You have to build the first line by yourself. Add "Seach:" - label and some state-Buttons. Then you can add the NSPredicateRuleEditor just under the view with heigh 1 (better 0).
Don't forget to set the Auto-Layout Constraints wisely.
Just like that: the big black line is the reduced NSPredicateEditor Take care about Auto-Layout.. You'll have to expand the view if predicates grow.