Create two on the left and right top corners
Do you use any 'Melee triggers' or actions?
Actions
Player Group - Make (All players) treat (All players) as an Ally with shared vision and full shared units
Actions
Actions
Player Group - Make (All players) treat (All players) as an Ally with shared vision and shared units
Don't use the event that was mention by him. Simply hide last created multiboard and show your multiboard when there's someone leaving the game.