Edit Curves > Modify Curves > Bend

Makes the selected curves (or selected CVs) bend in one direction. The curve’s first CV will maintain its original position.

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Edit Curves > Modify Curves > Bend >

Bend Amount: Determines how much each segment of the selected curves will be bent. The higher the Bend Amount, the more the curve will be bent. A curve with many CVs will be bent more than a curve with few CVs because the Bend Amount affects each segment.
Twist: Controls the direction in which the selected curves will be bent.