A Limit order is a delayed order which is used to specify the highest/lowest price (i.e the limit price) at which a trader is willing to Buy or Sell an asset. Traders utilize this type of order to improve the price at which they enter/exit the market. It is important to note however that such an order type does not guarantee execution as the market may not reach the limit price specified by the trader.
Order size USD - reflects the full size of your order taking into account selected leverage. An amount equal to the margin cost for a position is reserved on the Wallet balance immediately upon opening a position.
When placing a limit order, you will need to choose the Order Size USD and Limit price.
Margin cost - the amount of personal funds which are required and reserved in order to open a position.