Select from a dropdown of valid values in the Expression Set Builder when you write a List Filter condition on a picklist-type context variable instead of manually entering it. Use type-ahead search to quickly find a value in a long list, and get an immediate warning if you enter values that the picklist doesn't allow.
Where: This change applies to Lightning Experience in Enterprise, Unlimited, and Developer editions where Business Rules Engine and Context Service are enabled.
How: In Expression Set Builder, add or edit a List Filter condition and select a picklist-type context variable. Expression Set Builder loads the field's valid values into a dropdown.