It is great that Plasma immediately recognizes the fact that it has a dual screen.
We see this choice when you boot up. Check out the video or this bmp that shows the options. There is a variety of choices for your system.

You can invoke this window by pressing

Super + P

Plasma Challenge

You can follow our tutorials based on either of two iso's.

1. ArcoLinuxB Plasma (recommended)

We record the plasma video's on an SSD installed from the ArcoLinuxB Plasma iso.
You can either create your very own ArcoLinuxB Plasma iso following this tutorial or download it from Sourceforge. (ArcoLinuxB-plasma-18.11.2.iso of 4.3 GB - games included)

2. ArcoLinuxD Plasma

You can also use the ArcoLinuxD iso and then install Plasma with the help of the github scripts. This will not be an exact copy of the iso.

Learn about the Plasma desktop and enjoy it.