We want to allow our customers to interact with us using C and J.
But they should not be able to see which other customers are doing that too. So we want to hide theses users for them.
There's nothing you can do about groups - if a user is in a group, they'll be able to see that. Not the members of that group, just the actual group name itself.
To hide users, check the global permissions - there's a "browse user" function in there. Make sure only the people who should be able to see other users accounts are in that permission. The most common starting point for this is to have a group of users that are internal to your organisation - they get put in a group like "our org" or "internal" and given the browse user ability. External users are not granted the ability.
However, some points with this:
(I've rambled about Jira here mostly, but it's the same principle in Confluence)
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