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Contextual
Spline Contextual Menu
Loosen
Lengthens the handles on the selected spline. If a point is selected, only that point’s handles are lengthened. This command is available when one spline is selected.

Make into Line
Removes the handles from the points on the selected spline. If a point is selected, only that point’s handles are removed. This command is available when one spline is selected and that spline has Curve points or the selected point is a Curve point.

Make into Curve
Adds handles to the points on the selected spline. If a point is selected, only that point has handles added. This command is available when one spline is selected and that spline has Line points or the selected point is a Line point.