Open the first app
Swipe up slightly from the bottom to open the Dock
Touch and hold the second app in the Dock
Drag the app to the left or right edge of the screen
Release it when the split view opens
Adjust the divider to change each app’s size
To close Split View, drag the divider all the way to one side
To use Slide Over, drag the app to the center of the screen instead of the edge