You can control the appearance of the wheels by changing the current mode, or by adjusting the size and opacity.
The SteeringWheels are available in two different modes: big and mini. To change the current mode of a SteeringWheel, right-click the wheel and select a different mode.
You can also adjust the opacity and size for the wheels. The size of a wheel controls how large or small the wedges and labels appear on the wheel; the opacity level controls the visibility of the objects in the model behind the wheel. Change the settings in the SteeringWheels preferences.