How to adjust the size of partial components of mixamo's characters?


I am going to make a character customization by using the characters and prefabs in mixamo, however, for example the hair of the two characters dont match the others’ head, I tried to adjust the size of the hair component but it doenst work. What should I do?

Sorry the image upload failed, these are the two characters, I change their hair style by change their mesh of hair.