It doesn’t hurt elementary school aged children and having them move their chairs back and forth requires potentially chaotic transitions (kids get distracted, they hurt each other or themselves with the chairs, and there’s a bunch of noise that can distract other classrooms). The desks add a level of separation and distance that makes it hard to do some activities, like reading a story to the kids, and young kids really benefit from a transition between activities (we all do, but it’s more important the younger your learning group), which moving to a different part of the classroom creates.

Where I’m from, it’s also common to have kids circle up and do light calisthenics or stretching throughout the day to even out their energy levels, so this could be a stage immediately beforehand or afterwards.

Size-wise they look like high schoolers, but the classroom looks like it’s for young primary school students.