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Yes - all android devices with version 7 (Nougat) or greater of android can split window.
Samsung devices can do this with versions as low as 5 on certain devices.
Just long-press the app button.
You cannot split-window on the Pik TV box itself (a limitation of the android TV build).
FYI - the next build of android TV will support splitscreen, PiP, and DVR features: