1-. Turn on your steam deck

2-. Press the "Steam" button

3-. Go to "settings"

4-. Go to "Bluetooth and turn on the Bluetooth.

5-. Go to your Xbox controller and press "the Xbox logo button" in the middle of the controller, it will start to glow gradually.

6-.Then press "the button that is located at the top of the control" that has a signal logo with three stripes, this is the "pair button".

7-.Once you do this the Xbox logo button will start flashing constantly, this means that it is in the mode of connecting to bluetooth.

8-.Go back to your Steam deck and look at the signal that says "Searching for Devices", later if you have done it right the name of your Xbox controller will appear and you hit on it to pair it.

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This is the guide i used to explaine you:

How to Connect Xbox Controller To Steam Deck. WebPro Education, Youtube. https://www.youtube.com/watch?v=6oYBwMqBQfo

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