menu bar "helper arrow" during install doesn't work properly in Big Sur

<img width="1440" alt="Screenshot 2020-11-20 at 08 46 31" src="https://user-images.githubusercontent.com/75862/99793846-2c2d1800-2b21-11eb-8495-8e8cb16ef693.png">

We should just disable this in Big Sur and above. The on screen instructions are probably enough for now.