Was this feature removed in the latest updates? I have looked in various locations to include commonwealth, policy, and statistics and cannot seem to find where to toggle my charter from public to private. Not sure if it was removed or if I'm just overlooking it somewhere.
I have been wondering this as well. I prefer to have my own colonies in my charter, not having random people joining. This is primarily as I don't play or leave my main running 24/7, nor am I always at it.
I do not think the private charter function has been removed from the game, as I had one of my colonies charter's set to private before all of the menu changes and from what I can tell it is still private( since nobody has joined it). That makes me think that the option to change the privacy of a charter code has not been removed, but has simply been left out of the menu for now.
Mine was set to private so that no one else would join it and I just had someone join it that I didn't know.