As mentioned in this thread, regen will occur when pushing the brakes in any mode.Don't put it in "low mode" (center button on console) if your battery is fully charged...leave your battery with some unused capacity (say, 80%), so the regen doesn't overcharge the battery during the downhill descent. If all else fails, go into "whisper" mode, to reduce regen. I live in a very mountainous area (Lake Tahoe), so I'm NOT going to top my battery up...I'll just charge to 80%.
One of the drivers says he used neither
L nor 1pedal.
Neutral will guarantee traditional braking, so use that for some of the descent in this particular hill. Most likely not an issue elsewhere.