horizontal (left/right) headlight adjustment on 2010 Subaru Impreza Outback Sport

found vertical adjustment, need to adjust left (horizontal) any idea where to start?

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2 answers
Should not have to adjust headlamps unless vehicle has been in a collision, then it is the body shop responsibility to do so. It requires special aimers and proper procedures.
Should still be under warranty, too new a car for after market information to be up to date yet!