As suggested for the axonometric grid in PR #2028:

I thought about limiting the range of the angle widget. My thoughts were:

• Adding a NumberRange<int>? property to it, with all necessary checks, allowing us to limit the range.
• Fill the unavailable portion of the 'pie' with a different color
  I didn't do it in this pull request because I think it's already long enough and it might be better left to a separate pull request