LinkedIn groups without member approvals

[tyz]

I've created a LinkedIn group recently. Without any promotion, a few members joined. I noticed I need to approve every single member as a group manager before they are able to participate in the group. I looked for a setting to let people join without approval but could not find anything. Is it even possible?

What I actually want: An open group about a particlur topic where every interested member is able to join and create discussions/comments without any approval/moderation.