How to disable a Steam Controller
To disable your Steam Controller, simply open up Steam, go to 'Settings' > 'Controller' > 'General Controller Settings' and uncheck the box for 'Steam Configuration Support' for your controller type. This will stop Steam from recognizing your controller. Easy peasy!
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Just unplug it. Seriously, if you're not using it, just disconnect the controller from your PC. Steam won't pick it up if it's not connected.
If you're trying to avoid accidental inputs, you can also go into the Big Picture mode, navigate to 'Controller Settings', and from there, you can manage or disable controllers individually.
Honestly, why disable it? The Steam Controller is an integral part of the gaming experience on Steam. Embrace it!
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