Samsung SM-A505GT/DS User Manual page 59

Apps and features
Waking up Bixby using the Power key
You can start a conversation with Bixby by pressing and holding the Power key. To use this
feature, launch the Bixby app, tap → Settings → Wake Bixby with Power key, and then
tap the switch to activate it. Alternatively, launch the Settings app, tap Advanced features →
Wake Bixby with Power key, and then tap the switch to activate it.
If you want to access the power options with this feature activated, open the notification
panel and tap .
Access the power options.
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