You must select a node or a segment before you can make changes to the curve. When you select a node attached to a straight segment, the node appears as an unfilled square. If the node is attached to a curve segment, it appears as a solid square. The Status Bar indicates the type of node (smooth, cusp, or symmetrical) and segment (line or curve) selected.
To select a segment, you must use the Shape tool. To select a node, you can use the Shape tool, Pick tool or any of the basic drawing tools.
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