There are only technically "sides" in the courtroom. The defendant's family does sit behind her in a designated row (or two) as does the family of the victim. If family members have specific supporters that they want to join them, they'll likely go in that first row (which may be why there a people in front of Sandy. Other than that, all of the other seats on either side are designated for the public, no matter what "side" they support. KCL has, from time to time, been seated on the JA side. It really doesn't mean anything for anyone other than family members other than those were the seats that were available.