- Select one vertex on each side of the concave area opening.
The vertices can be on the same support or not. - Right-click the spline and apply
 or remove  a tangency constraint from the context toolbar. - To change the position of a vertex:
- Drag it on the boundary (within Fill Concave Area).
- Outside Fill Concave Area, double-click a point in the tree.
- Edit the length parameter of the point.
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