This feature is available in all editions.
Looking for a specific topic? Type your search terms in the quick search box at the top of any page to find matching topics.
From the left page, click Collaboration > Communities from the left pane.
Select or deselect the bookmark icon to the right of a community name.
Slide the toggle button to the right to see all of the communities in the system or left to see just the list of communities you have followed/joined.