Hi Denn,
for the Style and Left split points, the selected note is the HIGHEST playable note, and for the Right3 split point, the selected note is the LOWEST playable note of the Right3 part.
So, the default split point setting is:
Style: F#2
Left: F#2
Right3: G2
As mentioned before: Only when the Right3 split point is set exactly one semitone higher than Left, you can play all three Right parts layered in the same keyboard range. If you would set the Right3 split point to G#2 in this example, the Right1&2 parts would can be played only on one key (G2), and only Right3 would be heard from G#3 - C6.
Best regards,
Chris