[PSA] How to use your Steam Deck as a PC controller
xda-developers.com
Easiest way is by using remote play, you'll want to change settings to enable audio on the host, and possibly lower stream bandwidth.
The guide also has another more in depth method.
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Unrelated, my friends and I are in a spat regarding how evil mashed potatoes are and do they mean us harm. I've sent them a screenshot of this saying I have at least one ally against the potatoes. So if anyone asks, be cool!