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.
Click on the Collaboration icon in the tray on the left side.
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.