This is not a criticism in any way but the owner's handbook that accompanied my Optima from the factory provides a detailed explanation of how to set either no-dip, nearside-only dip or both-mirror dip.
My first acquaintance with the car revealed that the mirrors were set just as regular mirrors but the handbook helped me to change, initially to NS-only dip and subsequently to the both-mirror dip. Whether the methodology is the same or different with other models in the range, I don't know, but it works a treat for me.