I usually change the charge level BEFORE I shut off the car.I shut off the car, attempt to change the charging from 1 - 8a to 12a, but it will not change. The "button" stays yellow on 1 - 8, does not switch to 12a. When I touch the 12a "button" it makes a sound like it knows it was touched, but it will not turn to yellow.
I've observed that when my infotainment system experiences a reset while I'm driving, the charging display will dim out the level button and not allow switching to 12 amps. The solution is:
1. power off the car
2. get out of the car
3. close the door
4. get back in the car
5. press the infotainment power button
6. press the leaf button to select the charging display
7. now you can set the level.