Hi all,
The Dell in portrait mode is the reason of my question as although it shows as in portrait mode in the system above, the orientation of the window is landscape. The weirdest part is that the actual objects in the UI react as in portrait mode so there is a 90-degree different between the object (like the Finder window) and the way the actual Finder window is represented.
When I changed the rotation (using the keyboard to navigate the Display settings window as it is really hard to select the right object with the mismatch of rendered window on the screen and objects in portrait mode, I can get the monitor back to showing the UI in portrait mode however after reboot it comes back to this.
I am curious to see if anybody has faced the blank screen issue on an RX580 despite the monitor showing in system preferences and whether anybody has seen this weird portrait mode issue as well.