Actually, forget what I said earlier. I do not think that setting exists. Probably what you’re doing wrong is that you have to define the Game winner display time, Game score display time, Round winner display time, Round score dispaly time. The winner setting defines how long your win/loss screen should appear for at the end of a round. The score defines how long the game scoreboard appears for after the win/loss screen.
The difference between the round and game display time settings, is that the round display time show after every round, and the game only after the game has ended (so on the 100th round at the end it shows but the round win and score and after also the total scoreboard stats for the entire game of all players) you can leave the game display time settings on 0, but you have to define the round display time settings to 3 seconds or whatever you want