The camera controls
Your world consists of objects on a stage being photographed by a movie or TV camera.
There are two sets of camera controls.
The blue arrows in Figure 2 control the position and orientation of the camera.
The second set of camera controls consists of a text field, a slider, and some buttons on the right in Figure 2 immediately above the green button.
These controls deal with things like the aspect ratio, the camera lens angle, etc.
I will explain how to use the camera controls later.