It is important to note that the match data coverage CAN NOT be changed once a game has kicked off.
To change the match data coverage on an already created match, that has not yet kicked off:
Click on the matches in the sidebar on the left of your screen.
Find the match in Live and Upcoming list
Click the ellipsis, on the right of the screen (next to the status field).
Click Match Settings, the first option in the list.
Navigate to the top left of the screen and find the Stats section between Match and Overlay.
Adjust the data coverage as desired.
Click Save, displayed at the bottom of the screen.
You have successfully adjusted the data coverage of an already created match.