[xwiki-users] How to prevent unregistered users from viewing user profiles

We are using XWiki 5.2.1. One problem is, that every unregistered user can view the profile pages of all registered useres. I tried the following: In the XWiki space, I managed to prevent unregistered users to view any page of the XWiki space. This removed the mentioned problem. But then two other problems occured: unregistered users cannot see the logo in the top-left corner, and they cannot see the tag-cloud macro contents, which is signalled by an red-coloured error message. Are there any solve theses problems? Thanks in advance Matthias