Who: League Administrator
From User Home Page go to Manage League > Modify League Settings
If this option is set, when viewing lists of games, results will only be displayed as (W), (L), or (T) for anyone except league officers. This includes any guest visitors, coaches, players, etc. Referees will still see scores for games where they had assignments.
If the league has set this option, it can be overridden at the competition and division level. Thus, for instance, you can use it with some age groups but not others, or for recreational competitions but not competitive ones.