Insert knot
From TOI-Pedia
The geometry of the curve can be adjusted by adding extra vertices into the curve manually by inserting a knot: Edit Curves > Insert Knot. This enables you to locally add extra control vertices where more control over the shape is needed.
Opposed to the Add Points tool, you need to go to component mode, edit points, select a point on the curve and then execute the Insert knot command.
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