I just had a look at the editorial page.  It states that there are options to turn off the bangs and shoulders.  And in the Readme it shows that there are "bangs on/off"   and
"shoulders on/off" morphs. 

So the answer to being able to turn off the entire head of hair, is no.  But you can hide the bangs and shoulders of the hair.

If you like, I can still open the product up in Poser and double check for you.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi