Cabinetry built before March 7, 2016, may have optional soft close (the door closes itself after you set it in motion). Cabinetry built on and after March 7, 2016, is standard with soft close. Set the tension by sliding the grey lever (Switch C) up and down (Diagram 4). The door will have to cycle through one closing for the new setting to activate.
If you have further questions or concerns, please contact the StarMark Cabinetry dealer where you purchased your cabinetry.