Good question, @Zion!
There is staff user group with highest privileges:
https://overgrow.com/groups/staff (accessible also through “hamburger menu” then > About)
and then there is wider Team Overgrow (which includes also Leaders):
https://overgrow.com/groups/TeamOG
In general you can turn to TeamOG / Leaders for advise or help with topic management (see privileges). They can manage all posts and topics and have tools for that (edit & hide posts / move posts / merge topics / close topics / etc.).
Main difference is that staff (moderators) can also approve or disapprove (ban) member profiles.