Users can only choose between being visible with their full name in the "Who's online screen" or being not visible at all. The option of staying incognito - i.e. only showing your nickname which can be identfied by friends - is not possible at the moment. In the membership-tab of courses for example, that option is available by deactivation the public profile. The active users screen kind of ignores this deactivation right now and displays the whole name of the user. I think this should be changed with the next update.

Here's the Forum discussion and Mantis page for this issue.

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