There is nothing to deal with. If there is any money left after closing the position, just throw it there. If you want to continue playing, increase the money. I don't want to play, and the rest can be transferred. If you lose more money than all the money in your account after closing the position, the futures company can only make up for it with its own funds, and then the futures company will ask you to compensate him. Generally, the latter situation is relatively rare.