Function settings
Setting

With the engine on, select or deselect 'Driver Assistance → Driving Convenience' from the Settings menu to set whether or not to use each function(s).
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If 'Highway Driving Assist' (or 'HDA (Motorway Driving Assist)') is selected, it helps maintain distance from the vehicle ahead, maintain the set speed, and helps center the vehicle in the lane.

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If there is a problem with the function(s), the settings cannot be changed. Have the function be inspected by an authorized Kia dealer.
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If the engine is restarted, the function(s) will maintain the last setting.

For your safety, change the Settings after parking the vehicle at a safe location.
Warning volume

With the engine on, select 'Driver Assistance → Warning Volume' from the Settings menu to change the Warning Volume to 'High', 'Medium', or 'Low' for Highway Driving Assist.
If you change the Warning Volume, the Warning Volume of other Driver Assistance systems may change.