How to Connect an Xbox Controller to Xbox
If you want to communicate with deeper thoughts than reactions and emotions given to you by villagers, tap the R button on your controller to open an in-game chat window. You can type on it by manually selecting the keys with the controller or using the Nintendo Switch’s touchscreen. ...
That said, if you want to really go granular with how the controller works, the GameSir Connect Software is the way to go. Here you can customize the lighting effects, the two mappable back buttons, and many, many more functions.