Good morning Steve,
When the user changes the layout and reconnects to the same set of monitors, does it keep extended or does it fall back again to the first duplicate?
The behaviour on very first connect before Win 10 AE was decided by DisplayLink and the device manufacturer. However, since Win 10 AE, we must comply with Windows rule or the driver cannot get the Windows logo program. The Windows default for laptops is that the first additional screen, at first connect, is duplicated.
The screen layout is saved by Windows based on ALL monitor serial numbers connected at the time.
If you wish to try the first connect behaviour again, you can
delete the Windows display persistence keys to force rediscovery.
Kind regards,
Alban