How to use the cover screen of your Galaxy Z Flip

Simply tap and swipe on the cover screen to check system alerts, app notifications and check messages without unfolding your phone.
If the phone is folded and locked, press the Side key or double-tap the cover screen to turn on. The time, date and battery information appears first when you double- tap the cover screen. 

If a notification requires you to open an app, you are easily able to switch directly to it. Tap the notification on the cover screen, tap again, and then unfold the phone to directly access the selected app.

You can also control Spotify and other music apps from the cover screen.  Swipe to the left to pause the song or skip to the next track.  

You can tap the cover screen and swipe to the right to answer a call or swipe to the left to reject it. If you aren't using a headset or Bluetooth audio accessory, the speakerphone will be enabled when you answer a phone call with the phone folded. You can also use Bixby to help you make calls. Simply say, "Hi Bixby, call Mom."
 

How to setup Bixby to use when your phone is locked
 

Step 1. Unfold the phone and navigate to Bixby Assistant Home.
Step 2. Open the app, tap More options (three vertical dots).
Step 3. Tap Settings, and then tap the switch next to 'Use while phone locked.' 

Take selfies using the rear camera and preview on the cover screen without unfolding.
To activate the camera when the device is folded, double-tap the Side key. 
Photos can be taken using Volume down key and palm gesture.

• Dual Preview : Both the photographer and the subject is able to preview simultaneously through the viewfinder on the cover screen utilizing the On/Off option button on the upper right side of the camera menu.

• Dual Preview Indicator : Share to the subject (Timer, Flash, Recording) information so that the subject can prepare to get the best photo taken by the photographer.