https://www.pcgamer.com/how-to-use-a-nintendo-switch-pro-controller-on-pc/

The Nintendo Switch Pro controller was not designed to be used on PC, but that doesn't mean it can't be. It's still a comfortable, well-made controller, so it's a valid contender for your next PC gamepad or a useful backup controller for your next Gang Beasts couch session. That said, the Switch Pro controller has a few hurdles to overcome. It's a DirectInput gamepad, you're better off connecting it via Bluetooth, and you can't charge it while you're using it. 

Here's the best way to get your Nintendo Switch Pro controller working on PC using a tool called x360ce.