CAD GD&T callouts are best viewed at an angle that is perpendicular to the plane of the label. As the viewing angle moves toward 90 degrees from the perpendicular view, the text becomes less readable. This angle specifies the angle from perpendicular at which the text will become hidden. This option is applied when the UnreadableTextHide is set to TRUE.
Entry Name: UnreadableTextAngleDegrees
Entry Type: Real Number to specify angle from perpendicular in degrees. The default value is 30.