How to draw a fixed plane on a spline?

[kingston123]

I am trying to draw a plane on a spline: View attachment 2150

But I can't able to fixed plane, see it came outside the spline: View attachment 2151

How to draw a fixed plane?

 

[MrCATIA]

The little square is just a symbol to represent the plane (infinite in size). If you rotate the model, you can better see where the plane is, but it is exactly where you defined it (middle of the curve). If you want, you can edit the plane and drag the word "MOVE" to reposition the plane symbol closer to the curve.