Samsung SM-F946W User Manual page 111

Apps and features
Using Samsung DeX and phone simultaneously
While using Samsung DeX, you can use separate apps on the external display and your
phone simultaneously.
For example, while watching a video on the connected TV or monitor, you can chat with
your friend on a messenger app.
On the connected TV or monitor, open an app to run on the Samsung DeX screen. Then,
open another app on your phone.
Locking the Samsung DeX screen
If you want to lock the Samsung DeX screen and your phone's screen while using
Samsung DeX, select
While using Samsung DeX, you cannot lock the Samsung DeX screen and your
phone's screen by pressing the Side button.
→ Lock DeX.
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