Every group now has a dedicated group detail page, just like segments. You'll see the group's name and creation date at the top, with quick buttons to create a campaign or automation already set to that group. You can rename, split, or delete the group from the menu.
You can also add subscribers right from the group page. Click Add subscribers next to the search bar, find people by email, and add up to 50 at once. The list and subscriber count update instantly, no page reload needed. You can still assign groups from a subscriber's profile, too.