I would like to know if it is possible to use an external controller instead of using the mouse/keyboard in desktop mode on Steam Deck?

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[–] 6 points 1 year ago*

Yes

https://steamcommunity.com/app/1675200/discussions/0/6126609705338539181/

Boot into Dekstop Mode, open the Gamepad configuration, with the controller connected, swap the order of the controllers so the 360 is the primary (or see if you can turn off the Deck controller) and set your configuration for desktop there.

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