Galaxy S9/S9+: How to control the Samsung DeX's screen with a device?
You can use your device's screen as a touchpad. And touchpad support only when using Samsung DeX mode. If your device's case has a front cover, open the front cover to use the device as a touchpad. If the front cover is closed, the touchpad may not work properly. When you using your device as a touchpad, you can use it in either the horizontal or vertical alignment.
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