If you set the normal harmony (ie. not in ensemble mode) to Multi, you will get any 3 RH voices each playing different notes within the Harmony set. With trio R1 plays melody, R2 and 3 play the other 2 notes.
With 4 note harmony R1 plays melody plus a harmony note, leaving the other 2 voices to each play the other 2 notes.
And with Block R1 will play melody plus 2 harmony notes with the other 2 voices providing the balance. In addition you can turn off one or two of the RH voices and the Harmony notes will be shared differently.
So it's not only in ensemble that the Harmony can be "clever enough" to sort out the voices, in this case normal voices.
John