If you are using Button navigation mode:
a) Touch the icon at the bottom of the screen, your recently used applications will be displayed.
b) Touch the small triangle mark beside the name of the application at the top of the screen, If the current application supports split screen, there will be a ‘Split screen” option, touch it to choose the first app, and then choose another app to use split screen.
If you are using Gesture navigation mode:
a) Swipe up from bottom then hold on more than 0.3s, your recently used applications will be displayed.
b) Touch the small triangle mark beside the name of the application at the top of the screen, If the current application supports split screen, there will be a ‘Split screen” option, touch it to choose the first app, and then choose another app to use split screen.

Note: This Q&A question only applies to devices with split screen function.

Available settings and menus may vary depending on device model and software version.