FOR SAFETY REASONS...
Moving the report triangle to the left side of the Car Play screen would make if FAR easier for the DRIVER to report Hazards and other actions.
Currently, having the triangle on the RIGHT side of the screen requires reaching and taking eyes completely off the road to accurately click the icon. This is especially critical on newer vehicles with LARGE screens like Toytota Tundras. Moving the triangle to the Left side of the Screen would enhance safety and be easier to reach.