Solutions
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Old_As_Dirt's post in Lateral Field of View was marked as the answerUPDATE - The reason the default aircraft allowed the change was ------ X-Camera.... It had not been set up on that aircraft. I went back after setting up X-Camera on that aircraft and it would not change. I went to another default which had not been set up and it allowed change. The answer, I think, is that if you have X-Camera (a great program by the way), disable it, make the change, and re-enable it.
John