You'll see a menu on the left side of the page, under the phone number.
Depending on your version of XFINITY Connect:
Click on Call History to see all calls. The type of call (PLACED, MISSED or RECEIVED) will be listed in the second column along with the date of the call and the duration of the call. Use the Sort By menu at the top right of the page to view the list by call type (Missed, Placed or Received)
Choose from one of three Call History options: Missed Calls, Answered Calls, and Placed Calls. After you make your selection, a gray box will appear around the selection and you can see its history.
Note: Your call history information will be available in XFINITY Connect for 90 days.