There are a few settings in the AdminCP under the Forums app you might want to review. These are global settings that apply to all member groups.
RSS feeds enable a feed option for members to subscribe to get updates on activity in your forums.
The popular now option allow for intelligent flagging of topics that are popular right at that moment. Rather than relying on historical replies the system keeps track of number of posts in a topic within a certain timeframe so you can call attention to a topic that is about a current event or getting a whole lot of interest right this moment.
Of particular interest in this section, is the 'Default forum view' section. You can set this to one of the 3 layouts provided, and also give the option for your members to choose on the front end which they would like to see, using the option provided.
Because the Forums app is focused on discussion it inherits almost all of its settings and options from the Suite-level areas like member groups and global settings like posting control. Review our guides on how to use the Suite for more information.