Spline Polygon PropertyManager
You can control the shape of a 2D or a 3D spline by dragging or setting values for the
control polygon
nodes. Changing the locations of the control points (nodes), updates the values of the X and Y Coordinates (in 2D splines), and
X, Y and Z coordinates (in 3D splines) in the PropertyManager.
The control polygon is off by default. To display, click Options 
, Sketch, and select Show spline control polygon by default. To display the control polygon only for the current instance, right-click and select Display Control Polygon.
The Spline Polygon PropertyManager appears when you select a control point and make it active. You can drag the control points or adjust the values in the PropertyManager.
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Control polygon
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Selected point on control polygon active
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Parameters
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X Coordinate 
. Adjust the values for position relative to the x axis.
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Y Coordinate 
. Adjust the values for position relative to the y axis.
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Z Coordinate 
(3D splines). Adjust the values for position relative to the z axis.
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Relax Spline. Re-parameterize (smooth) the shape after dragging. The Relax Spline command becomes available again by dragging a node on the control polygon.
Select the spline again to display the Spline PropertyManager.