I’m not saying with 100% certainty but I have this same model (HP 24mh/1D0J9AA#ABA) purchased new from the mothership a few years ago and mine does indeed “pivot” 90 degrees for a portrait orientation. Prior to purchase, I was searching for a smallish monitor with this feature – and I have a recollection that there were several contradicting reviews on whether this model included this option. YMMV