I am having the same problem with my monitors.
I’m using a HP Probook 4540s with 2 HP EliteDisplays E241i monitors.
I used to have a Plugable USB3-HDMI-DVI. This has worked relatively fine for a year or so. But I had some issues lately.
We bought a new one: UGA-4KHDMI.
I unistalled the previous one, installed the new software en added the new device.
I keep having the problem where my 2 monitors are in mirrored mode. No matter what I do I cannot seem to get them to go to extended.
I tried all the solutions in the post (and the links) but nothing works.
Do you have any additional suggestions?
Note: This conversation was created from a reply on: Plugable-controlled monitor duplicates primary screen.