Screens

Automatically enter split screen mode from launcher shortcuts and Quick Settings
tiles.

Screens allows you to quickly enter splitscreen mode with pre selected apps. It
creates shortcuts that can be used from any launcher. This might be good for
productivity or having SeriesGuide and Kore at the same time.

This app uses Accessibility services. Accessibility services are required to
enable Multi window automatically, if you don't want to provide this open source
app with the permission you will need to manually hold the recents button when
prompted.