Can Any Monitor Be Used In Portrait Mode?

John Baro1 wrote:

I have a Dell display (s2421nx, 24-inch, 1920x1080) that I'd like to use as a second monitor for the Mac Studio I just ordered, but I'd like to use it rotated to portrait mode. This particular display does not support portrait (pivot) according to Dell, and the stand it comes with does not pivot. I was wondering if MacOS, or the Mac Studio, support rotating a display (other than the Studio Display). Or if there is a 3rd party solution. Is this a possibility?

How to rotate your monitor and use it vertically in macOS

I just tried my extended display which does not rotate and by changing to 90 deg rotation in Display Settings in System Preferences you get an image on the monitor which looks like an iPhone screen in the middle of the display only.