Two displays (screens) on device. How to work? - flutter

How to work with second display (screen) in Flutter?
A device connected to another screen via an HDMI or Wireless.
Support to run on two screens.
My question like as Which Flutter plugin or feature can utilize an external iOS/Android display showing separate content from the main display

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https://docs.flutter.dev/deployment/flavors\
https://itnext.io/flutter-new-app-setup-with-flavors-in-one-go-331471b127e3

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