2 Jan 09, 2019 19:30
I have a six or more collections but don't use the communities notion that you mention. Do you mean groups?
EDIT Ah! you mean Community as in the item/post visibility
Under Settings > User perms you can choose which users have access to which collections. However this is done per collection so only once you are in a collection can you select who can use that collection. And under group permissions there are options.
Basically select the collection > Settings > General and then select the members only option and follow that with the use rand group options to fine tune what collection each user can interact with, view, post etc.