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The horizon line shown in the viewport.
The horizon line might not be visible if the horizon is beyond the camera's field of
view, or if the camera is tilted very high or low.
To change the environment range:
Adjust the value of Near Range or Far Range.
By default, the Near Range=0.0 and the Far Range equals the Far clipping
plane value.
Environment ranges determine the near and far range limits for
atmospheric effects you set in the Environment dialog.
To see the environment ranges in viewports:
Turn on Show.
The environment range displays as two planes. The plane closest to the
camera is the near range and the one farthest from the camera is the far
range.
Using Cameras | 5213