Many settings can be modified during a game via the Chess and System Settings.
Some of these settings will only be activated with the next "New Game" command. These are especially settings with a significant influence on the game strength, such as the Elo limit of the engine.
If you are not sure whether the changes you have made are immediately active, select COMF MENU / SHOW ACTV to view the current settings. Parameters marked with a * symbol will not be activated until the next new game.