Open an app you want to use
Swipe up from the bottom to open the Dock
Drag a second app from the Dock onto the screen
Release when you see the split view outline
If you don’t see the second app, open the App Switcher and drag an app into Split View
To adjust the split, drag the divider left or right
To exit Split View, drag the divider all the way to the left or right
Alternatively, tap and hold the divider and select Close Split View