You might be increasing your risk while night driving doing that by making it substantially easier to overdrive your headlights and reducing visibility.

Im not saying dont properly adjust them, but going to the lowest setting possible is likely not the answer and a very real risk factor.

Cars missing that dial are auto-adjusting, you only change the initial setting if they're wrong. It's adjustable on the headlight assembly itself. 1% decline is what you're meant to be aiming for. It may also be adjustable via dealer-level diagnostics.