Disconnect controller?

I connected my Xbox one controller to my mobile phone, which worked fine, but when I want to "disconnect" it, it blinks the whole time (as if I want to connect it)

how can I "disconnect" my controller

All you have to do is check the blueblabla on your cell phone to see if it has been disconnected. My controllers flash when something is wrong, i.e. There's a connection error.

So it is already disconnected but it no longer connects to my Xbox.

The way I see it, he's already separated.

The reason why it keeps blinking is obvious. It is no longer assigned to any device and tries to establish a connection.