Can someone please inform me on how to find administrators of a group in /design since 18.2 doesn't have /designer anymore? Please see screenshot below.
Group security is not a one to one mapping of the administrator tab in /designer.
Discussion posts and replies are publicly visible
Administrators of a group are just those assigned the "Administrator" permission level on the group's rolemap + the group's creator. You can find that by selecting a group and clicking the "Security" button in any Appian Designer UI or from the Security menu option when viewing a specific group's member (screenshot below)
You can read about a group's security in our documentation: docs.appian.com/.../Group_Management.html