Amazon.com: AOC 27B1H 27″ Full HD 1920×1080 Monitor, 3 …

They claimed that at the top (near the monitor) there was a “D” shaped cover. I must of staired at it for a couple of minutes, unconvinced there was a removable cover. So as an act of faith I took an electrician’s screwdriver (12″ long with a 3/16″ blade) and stuck it up the pipe. Nothing!. so I gave it a light tap and presto the cover frew off.

https://www.amazon.com/AOC-27B1H-1920×1080-Frameless-Flicker-Free/dp/B07D1L3XGL