I asked Claude, don't know if it is correct: The red illuminated switch in the 2020 Opel Corsa appears to be for the Sport mode feature. This button, positioned below the headlight controls on the dashboard, activates the vehicle's Sport driving mode which typically modifies throttle response, steering feel, and transmission shift patterns for a more dynamic driving experience. However, since I can only see the switch itself and not its surroundings or any identifying symbols/text, I recommend checking your owner's manual or Opel Corsa documentation to confirm the exact function of this particular switch in your vehicle's configuration.