Samsung Galaxy A8s User Manual page 46

Apps and features
Press the Bixby key to open Bixby Home. To close Bixby Home, press the key again.
Press and hold the Bixby key to launch Bixby Voice immediately. While pressing and holding
the Bixby key, say what you want to Bixby Voice and then release your finger from the key.
Bixby Voice will perform what you request.
Available Bixby services may differ depending on the region or service provider.
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