Anonymous Users shouldn't get user in the Quick Navigation result

Quick Navigation has been a great help to search contents in Confluence with the drop down list. However, some customer would prefer their user name being search by anonymous users.

Use Case:

Some Confluence instance may use email addresses as a standard username for internal user to login. However, the platform was used as a documentation source which they give anonymous users access to it to review the contents.

In their business practice, they would not prefer the user(email address) to be search or shown by anonymous users in the quick search result.

Disabling the Quick Navigation solve the problem but that would render the search in Confluence to be not that efficient.