You should look up the 'split points' in the manual.
Usually, the keyboard is split into 2 main ranges
| Chord detection + L | R1 + R2 + R3 |
You can if you want make it 3 ranges
| Chord detection | L | R1 + R2 + R3 |
| Chord detection + L | R1 + R2 | R3 |
Or 4
| Chord detection | L | R1 + R2 | R3 |
You can choose the position of each split.
It will get a bit cramped on a 61-note keyboard though.