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Unable to Use Portrait Mode for HP VH240a Using MacBook Air 2017

HP Recommended
HP VH240a Monitor
macOS 10.15 Catalina


I recently purchased the HP VH240a, 23.8" monitor that rotates to the vertical (portrait) position.  It is to be used as an external monitor for my MacBook Air 2017.  I connected the monitor to the MacBook Air with a HDMI - Thunderbolt adapter cable and the monitor works perfectly fine.  However, when I rotate the monitor to the vertical (portrait) position, the screen continues to be in the horizontal and not the vertical!  The manual (p. 17) says:  "To correct screen position (Horizontal Position or Vertical Position): Press the Menu button on the monitor to open the OSD menu, and then select IMAGE POSITION."  PROBLEM - the OSD Menu does NOT SHOW "Image Position"!  The HP website does not show a driver (disk or download) for this monitor.  What do I need to do to work in the portrait position?  

Thank you for your time and assistance.   

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