Back when sensors, electronics, and servos were unaffordable or unavailable, it made sense to have a low beam height control as the resting pitch of your car could vary by several degrees based on passenger/cargo load, trailer tongue weight, etc.
It seems vastly less necessary now to have that control in the hands of the driver.
No, the level is fixed for the high and low beams. I guess the driver can adjust them with a screwdriver but not while driving.
I’m just mentioning that headlight automation was being done back in the 1960s with simple electronics. Just a photo cell and a lens. The driver can adjust sensitivity.
It seems vastly less necessary now to have that control in the hands of the driver.