You can adjust a Page 5 setting like brightness or white balance on 1 light without affecting the rest of group.

To adjust them separately, you have 2 options: 

  1. "Solo on" just the one you want to change, or "solo off" the ones you don't.
  2. Temporarily change the group on 1 light (adjust, but don't save). This method is more useful if you have a large number of lights you want to change, as you can put them in a temporary group together and adjust them all at once.