QR code

Hi, with the new version 6.9.1, there's a QR code in the top right corner of the login screen. I wanted to understand its purpose. If we click on it, it gives us the server address information, and immediately below that is configuration.
I was wondering if something needs to be set?
What is this QR code used for?

It's just your server URL.

Is there anything I need to set in the configuration field?
When I try typing above, I notice that the QR code changes.

I don't know. What do you want to use it for?

Maybe I expressed myself badly. What is the purpose of the field under the QR code?

The purpose is to be able to quickly configure server URL in the app.

Maybe like this?
esempio: http://demo.traccar.org:80