There isn’t jury, it’s a Bench trial.
Trump (all the best people) employed an idiot lawyer who neglected to tick the ‘trial by jury’ box.
The trial is in any case a civil litigation, nobody is going to jail - although Trump could be sent to jail for contempt of court ‘Doxing court officials’ being his first strike.
Getting sent to jail for contempt of court is a matter of the judges discretion, again nothing to do with a jury.
I agree with Tug, ‘Doxing a court official’ should have earned Trump time in the slammer.