To modify all the hair at once, edit the hair system. Before editing, be sure to be either in the Start or Rest Position.

To edit the hair system attributes

1. Select the hair system in the Outliner or Hypergraph. (Window > Outliner, Window > Hypergraph: Hierarchy)
2. Modify the settings in the hair system’s Attribute Editor. For descriptions of the hair system attributes, see hairSystemShape.
3. To see the changes you may have to play the simulation. See Play a hair simulation.