This options allows you to control whether JedeyeFX should open
only buy orders,
only sell orders,
none. If you are a trader that likes to trade in semi-automatic mode (many price-action traders do) you should consider what kind of trading you want to follow, considering the current trend and patterns. To that end, this option may be of great use to you.
On the other hand, you may want to halt trading for some time or use other JedeyeFX's features without opening orders, which in that case, the none option may be quite useful.