IME, at t-ball practices there are no stands, and parents either all stand or sit in chairs on the edge of the field.
I am looking at this from the POV of a parent who is 14 years into sitting at roughly 3 out of 4 seasons a year of pretty much every youth/HS sports there is, for 3 kids. I tend to sit away from other parents so I didn't have to listen to them yelling at their kids or complaining about the coaching/reffing. I just wanted to enjoy the freaking game or practice!
I am, also, a coach of a sport where parents, thankfully, are not allowed to attend practices within talking distance of their kids, however we do play at some fields where the parents have access to sit right up to the ropes. I really don't want to hear parents yelling at their kid to behave and pay attention whether I am coaching OR parenting, TBH.