What is Windows 10 multiple desktops?
click the "task view" on the toolbar, you will see the "new desktop" area on the right-bottom corner.
and then click to add a new desktop
you can move apps from one desktop to another.
Split Screen is not a new feature.Since windows 8,you can split screen.
just see the steps below:
drag to the left-top section.
to the right section.
the result is like this:
you can split your screen into 4 sections.