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Firstly, swipe down from the top of the screen using two fingers. The Quick Settings
menu will appear. Swipe from right to left and tap on the Samsung DeX
Alternatively, you can dock the Galaxy Tab S4 onto the book cover keyboard case* and DeX will launch automatically.
*Book cover keyboard case sold separately
DeX automatically adjusts to landscape mode.
To start using it, tap the dotted square icon
at the bottom left of the screen which will display all your apps.
While in DeX mode you can use your Galaxy Tab S4’s screen as a mouse and keyboard. There’s also the option to connect a monitor, Bluetooth mouse and keyboard too.
To exit DeX Mode simply tap the small arrow on the menu bar at the bottom of the screen. Then tap the DeX Mode