The information in the member list is configurable by group administrators and viewable by members according to your group's privacy settings for shared information. If you don't want your information shared in the member list, you can opt out. To do so:
* Go to settings > membership info.
* Click "view & edit shared info" under your group.
* Uncheck the box "allow members to find me on the member list."
* Make sure to save your changes to confirm your decision.