Navigate to the Menu and click on My Team.
A card will be displayed for each of your direct reports. Click a User's card to be taken to either their profile or a filtered view of the My Team Activity area - the destination of the card can be configured by Super Administrators in Site Settings.
Click the All My Reports radio button in the Filters on the left of the page to display all of the Users who report directly to you as well as all the Users who report to your direct reports.