Automatic position

If there is a position, the position will be closed first. If it exceeds the number of current positions, a new position will be added.ex: There are currently 2 Buy / Long Apple stocks in your position, if you place a sell order for 3 Apple stocks and select [Auto], the existing 2 Apple stocks will be closed as Sell order and 1 new Apple stock will be added as new Sell / Short position in which you will gain profit when Apple stock price drops below your selling price.

Open Position

The asset has not existed yet in your position, use this option when you want to open a new position.

Close Position

The asset has been existed in the position, use this option when you want to offset or clear an existing position.