SL and SR button failure can render a Joy-Con ... the "R" (or "L") button and choose the "SL" button from the options. Select ...

Along with this, you can also expect to pair controllers in the same way - where you click on the controller menu and then sync your gamepad of choice with the L and R ... Joy-Con controller SYNC ...

To fix a Nintendo Switch ... won't turn on when using a Joy-Con controller? You know you’ve got a controller issue if you can turn on your Switch using the power button, but not your Joy-Cons.