It is important to note that the match data coverage CANNOT 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 Matches in the left hand side dashboard
Find the match in the Live and Upcoming list
Click the 3 ellipsis next to the match you wish you edit
Click Settings, the first option in the list
Navigate to the top left of the screen and find the Scoring & Stats section between Match and Streams & Overlays
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.