Samsung's DeX mode is a dedicated desktop mode that you can find on a number of Galaxy smartphones and tablets. Over the years, the feature has greatly improved to offer a bunch of new capabilities, allowing you to seamlessly switch between devices.
At present, there are a number of ways to access DeX and here's a quick guide to help you get started.
These Samsung devices support DeX mode
Not every Galaxy smartphone or tablet support the DeX mode. However, some of the latest smartphones including the Galaxy Note 10+, Note 10, Note 10 5G, Galaxy S10+, S10, S10e, and S10 5G do support DeX.
Further, the Galaxy Note 9, Galaxy S9+, S9, Note 8, Galaxy S8+, S8, S8 Active, Galaxy Tab S6, Tab S5e, and Tab S4 also support the feature.
Using DeX on external display via USB-C cable or hub
Using a USB-C to HDMI adapter is one of the simplest ways to use DeX mode on any of the aforementioned devices. However, if you don't have wireless peripherals, use a fast charging-compatible USB-C hub wherein your keyboard can connect via USB-A.
Now, connect your device to the monitor's HDMI port and DeX should start automatically. Otherwise, trigger it from the drop-down notifications menu.
Use your device as a trackpad
In case you don't have a mouse to connect with your external display, you can use your phone's screen as a trackpad. Once you've successfully entered DeX mode, pull down the notification shade on your device and tap on Use your phone as a touchpad.
You can also connect via an official DeX Station/DeX Pad
Back in the Galaxy S8 and Note 8 days, DeX was available only via the DeX Station or DeX dock. Similarly, a DeX Pad was introduced for the Galaxy S9 series.
Interestingly, these DeX adapters function as USB hubs as well and can serve as a one-point solution.
To get started, simply connect the DeX Station/dock to your display via HDMI port.
How to use DeX on a laptop or computer?
If you have a Galaxy Note 10 or Note 10+, you can automatically enable DeX mode on your Windows and Mac by connecting your device via USB-C cable. However, your computer will require a DeX for PC app.
Notably, in this mode, you can use DeX in a full-screen view, drag-drop files, and can still use your smartphone in a regular way.
Pairing devices with DeX
If you're using a DeX Station, DeX Pad, or any other hub, you can connect your wired peripherals via the available ports. However, for Bluetooth accessories, you'll have to pair them with your phone by going to Settings -> Connected devices -> Pair new device.
Things you can do using the DeX mode
With DeX, you get a full-fledged desktop experience for everything that you can do on your handset or tablet. You can access your device's apps and even download DeX-optimized apps from the Galaxy Store.
Therefore, you can seamlessly switch from writing an email or marking up a document, or editing a photo on your phone to doing these tasks on a desktop.