A zoom in and Out option while an event is launched for a larger party then back to regular sizing

I would try to get a approved hidden zoom option maybe on the left or right side of the screen where if we touch and scroll up or down it'll zoom in and out or maybe if we do the two finger pinch in or out it'll let us zoom in or out. It's sooo many of us needing that option because of course once screen is locked inside the

booth and in launch mode it's hard for that option in camera settings to be used to help us ipads users. So we are needing to move our booth front and back all event. My drop off booth was damaged due to this by a client's family