Try resizing your Zoom window and other video feeds so that the human heads are at the scale they would be if sitting across from you. Too large and it feels like they're right up in your face.
Normalize looking away from one's camera during Zoom calls except when talking towards it.
Otherwise calls make every attendee feel like they're performing public speaking (a common phobia) even when they're silent (which feels like you're choking on one's presentation). All of this can occur without any conscious awareness on the part of the attendees.
@jcholder I can agree if the call is just nothing but talking, but if something is being demo'd or collaborated on then it'd be really impractical.
@joshuataylor Yeah. It reflects the problem with having laptop cameras pointed at one's face by default. External webcams make this much more practical.