Yes, on the KTM RC 200 2017 model, the headlights can be turned off even when the switch is in the "on" position. The motorcycle is equipped with a headlight switch that allows you to control the headlights according to your preference.
Typically, the headlight switch has multiple positions, including "off," "low beam," and "high beam." By switching the headlight switch to the "off" position, you can deactivate the headlights while keeping the other electrical systems powered on.
It's always recommended to follow local traffic laws and regulations regarding the use of headlights while riding your motorcycle for safety reasons.