Secect Resistive channel Type at MISC tab.

1. Check Setting
2. Clear previous buttons
3. Click Auto Detect

4. Press the steering wheel buttons one by one.

5. After all the buttons are detected, click Auto Detect again to finish auto-detection.

Button bar turns to green when the steering wheel button is pressed.

If the buttons in JoyCon Explorer are too close each other, tune the Adjustment A/B on the Board.

Resistor range and position of the buttons are stored in the onboard memory of JoyCon Exd.
The resistance values can be fine tuned manually. After you change the values, click Save/Apply.