OK, thanks; I followed all that (getting ScreenXpert was a hassle. It seems not to be searchable on Microsoft Store but I found a direct link via a Reddit post).
But ... no change.
Can I ask a couple of questions?
When I run ScreenXpert should I see any visible effect such as a window? There seems to be no effect at all, but it shows up as a running task in Task Manager, so maybe it's just something that runs in the background?
I should be able to move and/or delete or add to the icons that show up on the screenpad, right? Just like the main screen? If I try to drag an icon from the main screen to the ScreenPad the mouse cursor changes to "not allowed" when it's over the screenpad.
Are there any options in the Display Management interface that I should be looking at? ATM the screen pad shows up as display #2, and seems to have some overlap with the settings for the main screen. Eg if I select a background slideshow for the main screen (option "Centred"), I get images from the same folder on the screenpad, but at a resolution that (maybe?) corresonds to the main screen, i.e. I only see a part of the whole image.
Not sure if those questions help much. Thanks for your time.