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I had a hard time doing so and had to turn the second router off for the controller to pick up the first
@Yahya I don't think there is a setting for this unfortunately. You'd need to reset the controller, by pressing and holding the Google Assistant and Capture buttons simultaneously for 6 seconds, until the controller vibrates. After the reset, you will need to set up your WiFi connection with the Stadia App again to play wirelessly.