Orthogonal camera problem! If I make the radius large, the thing becomes huge, how is the problem solved? if the radius is less the objects disappear
Providing a repro in the playground would be helpful as your current test is a bit hard to handle.
Basically on the camera you have a min and max Z defining the frustrum of the camera so your object should be in this range to be visible.
In ortho mode the size should nevertheless never change in this mode as there is no perspective providing this feeling of zooming in out.