Dunno if anyone has brought this up but Trump basically never looked at Harris. Even had his face turned her direction and just looked at the moderators. The only time he looked at her was when he was forced to at the start where she went to shake his hand. Dude hates her so much.
I would expect that stuff like who you are facing, basic body language and stuff, is choreographed. I don't think it'll provide a lot of insight into inner thoughts.
I remember once reading a whole article on the issues with having a presidential candidate be photographed wearing a hat, which is a lot more esoteric than this sort of thing. Lot of time and money spent on optimizing it.
Kamala might have worked on choreography, but Trump? No. Not only is he not going to let anyone tell him how to behave, he couldn't repress his inner toddler if he tried. It only took a couple of subtle "I'm not touching you" - type nudges from her and he had a tantrump.