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Select the curve.
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Select the node you want to change.
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On the ribbon, click the button for the node type you want to change the node to: Smooth, Symmetric, or Cusp.
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You can use the arrows on the ribbon to select a node.
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You can use Insert Node on the shortcut menu to add nodes to a curve.
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You can use Delete Node on the shortcut menu to delete nodes from a curve.