Why does the AC blow the air mostly in the floor: on 2001 Buick LeSabre

AC blows cold air, flow is mostly in the floorboard, even thought the control is set on "mid". Very little air comes out the vents.

Asked by for the 2001 Buick LeSabre
It will probably be the mode door actuator causing your problem.
Thank you. Would I need to go to an AC shop or a general mechanic?
General experienced mechanic