How does the Activity row in my inbox work?

Tap the pinned “Activity” row at the top of your inbox to open your notification feed. It shows the latest notification and an unread counter. The feed has tabs: Overall, Event, Community, Team and League, and groups items into Today, Yesterday and Last 7 days.

Use the back arrow to return to your chats. On a wide screen the feed replaces the chat list in the left column while it is open. Your notifications arrive here, and tapping one opens the screen it is about.