Nope, it only changes when the fireteam leader changes. If you start an activity and can't check your privacy settings before doing so, it's your own fault.

You may think it only changes when you change fire team leaders, but it doesn't. I have had it go from open to closed, closed to invite only, friends to closed, closed to friends. All while inside an activity. Also, you are pushing this point quite vehemently instead of looking at the big picture. Just because there are open spots, doesn't mean people want to play with you. You will get the boot if I don't want to play with you and then the settings get changed. Not everybody boots up the game and goes "well I better change my settings" until after it happens. Ask me via a message (all the consoles have them) if I've got an open spot and I will send you an invite if the answer is yes. Other players on this forum have stated that they had a "friend" join them when he was soloing the it and leave shortly after they joined stating they kept getting an error. He kept doing that over and over. Just before he got to the boss the guy joined again and said out loud "okay he is finally there join on me" when he meant to say it in party chat. So instead of joining an "helping out" he kept jumping the game until the dude was at the end and then invited his own friend to join him.

If you set your privacy settings to invite only you won't have to boot anyone. The fireteam will remain in your control. If you have friends on your friends list that you don't enjoy playing with, your inability to manage your friends list is the problem.

It is funny that you ignored my post just to keep pushing the same record. Keep being a douche.

Lol I responded directly to your post, and haven't attacked anyone personally. Just stating observations.