Is there a simple way to set a matchmaker match status to isPrivate?

Is there a simple way to set a matchmaker match status to isPrivate? I can control visibility of lobby matches displayed to a user by checking player count against room size . I get the list of matches and loop through them to determine if each match should be displayed as an open game using this check when players are searching for mm games

Code (CSharp):

1. if (manager.matches[i].currentSize < (manager.matches[i].maxSize - 1))

This works fine, except once the game starts if...

Is there a simple way to set a matchmaker match status to isPrivate?