List of calendars without login


I was playing around with DAVdroid on my phone and my calendars on Nextcloud. I tried to add a new account in DAVdroid. There I noticed, that I get a list of all my calendars in the debug log, even when I had a typo in my password. So I tried again with an arbitrary (non-existent) username and password. Even in this case, I got a list of the calendars on my Nextcloud.
Is this the expected behavior? I don’t think, I want anybody to see the names of all my calendars.

What do you think?
Thanks for your input!

Can you share this on and share also your configuration?

Thanks for your reply. I will share it there.
Which configuration exactly should I give?