Is there a church policy that suggests or allows a Bishop or Stake President to require a member not to discuss faith/repentance/baptism with other members and non members in the privacy of their own home, even if that is all that is discussed? And if so why?
Rather the opposite. We are encouraged to share our testimonies with whomever is interested in hearing it. I can’t think of a situation offhand where any church leader would seek to place such a restriction on a member, other than if said member was known to be telling falsehoods or making apostate statements in such regards.
There are things we cannot discuss in the home that deal directly with the temple ordinances. However, those certain items are to be discussed only while within the walls of the temple itself. This is a general condition upon all who have attended temple ordinances such as the endowment. As far as general church doctrines, and teachings, there are no limits whatsoever.