Why Docker login to remote source ? Its an local installation

Dear community,
Ive setted up dock on Windows with Version 18.06.1-ce-win73 (19507) and its running…

Now everytime I am starting my computer, I have to authenticate to https://hub.docker.com via shell but why ? Its a local installation and therefore I dont understand why I have to authenticate to remote source…

Is it possible to switch that ?

Thanks in advance.