Hi Skyview-
You are able to program the buttons on the remote in the go4 app. Go to the remote section in app. I encourage you to go through the app and all the flying/camera options.
I set my c2 button to make the fpv camera pop up. Also when you depress the c2 button and use the top left wheel on remote you can tilt the fpv cam. Also- If you are using the app on an iPad you can tap the fpv view to enlarge- there's a little square to tap.
Good luck and safe flying.