Are you asking how to change to a different view while racing? Like, to switch out of the cockpit to the chase cam? I dont recall the specific button map, because I changed mine. But from any screen, access Options>Control Settings>Primary Functions. From here, scroll down a bit and look for "Driving View". If the button isnt mapped to a key, you can enter any key you want. I mapped it to "C" on my keyboard. (short for camera for easy memory)
You can also try using the Insert key. The Home key has a roof camera option available on some cars too.