there have been many discussions around this topic, for example see Limit the contacts that appear to a user when sharing to contact only within their "Groups"? - #7 by Col . One of the responses even tells you how to disable this sharing.
there have been many discussions around this topic, for example see Limit the contacts that appear to a user when sharing to contact only within their "Groups"? - #7 by Col . One of the responses even tells you how to disable this sharing.