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Select the curve.
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Do one of the following:
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To change an open curve to a closed curve, set the Curve Type box on the ribbon to Closed.
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To change a closed curve to an open curve, select the node you want to open, and then set the Curve Type box on the ribbon to Open.
If you do not select a node, the software opens the curve at the node that was automatically activated when you selected the curve.
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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.