If you're using Mastodon through your server's website, Local and Federated timelines are now available through the "🌎 Live Feeds" link at the right side of the screen:

 - "This Server" shows the latest public posts on your server, the equivalent of Local.

 - "Other Servers" shows the latest public posts from accounts on other servers that are visible to your server.

 - "All" shows all posts that are visible to your server, the equivalent of Federated.

Apps will have their own interfaces.