Galaxy S9/S9+: How to change screen mode on the Samsung Dex mode?
Last Update Date : May 07. 2018
1
On the status bar, tap "Samsung DeX Button" and tap "Arrow Down" next to Samsung DeX.

2
Tap "Arrow Down" above Using Samsung DeX and select SCREEN MIRRORING or FAST CHARGING.

SCREEN MIRRORING: Samsung DeX mode will be ended and the same screen as your device will appear on the connected TV or monitor.
FAST CHARGING: Samsung DeX mode will be ended and your device will start fast charging.
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