It’s called regen braking and puts energy back into battery. You can also control how strong the regen is in settings.

I prefer strong regen and hold mode. The car will slow as soon as you release the accelerator pedal. Hold mode basically means the car stays put when it’s stopped until you press the accelerater. Creep mode would have the car roll forward when you release the brake.

The one pedal driving works really well but there is a small learning curve. I would find it a bit annoying to switch back and forth like the valet guy.