From there, you can hold down the sync button located at the top of Pro Controller, which should allow it to connect to the console. Best Nintendo Switch 2 Pro Controller Alternatives ...

Press and hold the Sync button on your Pro Controller for one second, and it will pair with your system. How to connect additional Joy-Cons to Switch Joy-Cons can be synced with a Switch Lite as ...

To sync the Pro Controller without attaching it to the Switch, simply navigate to the Change Grip / Order menu and press the Sync button on the top of the Pro Conroller.

If a controller that worked before won't sync, press the SYNC button anyway (again, the small circular button). Your Switch may have forgotten the controller and needs to be reminded of it again.

First, turn off your controller. Then, push the Sync button located at the top of the screen. Doing this immediately kills the power and doesn’t desync the controller from your Switch — go figure!

To sync the Pro Controller without attaching it to the Switch, simply navigate to the Change Grip / Order menu and press the Sync button on the top of the Pro Controller.