When a verdict is read in any US court, the defendant is required to stand. The defense attorney (s) and the prosecution team also stand as the verdict is read. Seriously, Hallmark, you're much better than this - hire a consultant with a clue about basic US courtroom processes.
In the US legal process, sentencing does not happen directly when the jury returns a guilty verdict. There is a procedural delay while the prosecution and defense make their case for the sentence, the appropriate corrections agency to evaluate the defendant to make recommendations and even the potential for a hearing in which impact statements and other mitigating factors are presented and evaluated. This movie is just not an accurate depiction of true legal practice.