Lane keep (button low to side of steering wheel) is deactivated with a long press. But seems you might be talking about lane follow (button on steering wheel) that would just take a normal press of this button.
I did not know Lane keep would turn of without hands on the wheel (never tried), but lane follow will.
Can confirm that a long press of the lane keep button turns it off. Can also confirm I usually find out when I get to my destination that I also accidentally hit the button to open the gas tank door when doing so.