Use middle mouse button to Orbit

To start the Orbit tool with the middle mouse button:

1. Use the scroll wheel or middle button on your pointing device and drag to orbit the model.
2. Release the button on your pointing device to return to the wheel.

Note: This is the behavior when using the default Autodesk Simulation template under Mouse Options in the application options. The action of the middle mouse button and keyboard modifier keys can be customized.