The 3D View is just a monitor window, but very useful, in our opinion, to realize practically what is happening around the listener while he is immersed in our soundscape.
The listener has a funny “nose” and two squared ears to let you control his point of view (or listening?) and the spheres change their dimensions when their position is more or less higher.
When you select the “Cone” checkbox in the relative mixer strip of a sphere, in the 3D View you will be able to visually evaluate the directivity angle of an audio source and the emission cones.