Available options vary depending on view type. Have you tried pressing F1 to cycle it?
As Brun says the options vary per cam, are you sure you’re not in e.g. helmet cam where they’re not available (I think) rather than cockpit cam where they are.F1 just cycles the view, it doesn't give back the options to turn off Driver and Wheel or Movement which I had turned off - they're now back on and I want to turn them off. I do have options for FOV, Height, Distance.