For various options you will need to select either the hair system, hair follicles, curves, or CVs.
See also Select curve components for nConstraints.
To make it easier to pick a hair system, curves, or follicles, set the following pick mask:
And then you can select nHair > Convert Selection to convert your curve selection to the hair system, follicles, specific curves (Start, Rest), or CVs. See nHair > Convert Selection.
You may find it easier to select curves by turning off the Strokes display. (Show > Strokes)
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