Devices controlling DJI aircraft can only have one flight controller operating at one time. Mobile devices, both iOS and Android, as well as the DJI CrystalSky and DJI Smart Controller, must have one flight app completely closed before using another, otherwise there is the potential for one flight app interfering with another. For instance, if DJI Go 4 was running and the pilot wants to change to Litchi, DJI Go 4 must be completely shut down. The only way to ensure the app is completely shut down is to Force Close the previous app.
This short video shows how to Force Close an app on the DJI Smart Controller.
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