Kia Optima: Cruise Control System / To cancel cruise control, do one of the following

Kia Optima DL3 2019-2021 Owner's Manual / Driving your vehicle / Cruise Control System / To cancel cruise control, do one of the following

Depress the brake pedal.
Shift into N (Neutral) with an Automatic transmission.
Press the CANCEL switch.
Decrease the vehicle speed lower than the memory speed by 20 km/h (12 mph).
Decrease the vehicle speed to less than approximately 25 km/h (15 mph).

Each of these actions will cancel cruise control operation (the SET indicator light in the instrument cluster will go off), but it will not turn the system off. If you wish to resume cruise control operation, move the lever up (to RES+). You will return to your previously preset speed.

To decrease the cruising speed

Follow either of these procedures: Move the lever down (to SET-) and hold it. Your vehicle will gradually slow down. Release the lever at the speed you want to maintain. Move the lever down ...

To resume cruising speed at more than approximately 30 km/h (20 mph)

If any method other than the CRUISE ON-OFF switch was used to cancel cruising speed and the system is still activated, the most recent set speed will automatically resume when you move the lever ...

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