All members of the group - Moderator?
Better to just moderators group had the opportunity to moderation.
You can create new groups, they appear in that table, if you want just that group to be able to see a category, go to that category in the ACP, and tick Find, Access & Read, Create Topics & Reply.
Untick registered-users boxes and guest boxes, Save.
Thank you, but unfortunately is not suitable.
I want to make a feature site - groups.
Groups be located on the main page. Every registered person can create their own group on any topic. The discussions I want to do within the groups (without categories).
Unfortunately, to do this is problematic.
Need to purchase programmers services for that.