To place a fixed quantity per operation, you can do it in the open button (to the right of the configured rule).
Once opened, you can set in the first parameter; the fixed batch per order to open (Order Volume, in the image below the red rectangle).
To set a percentage on the account money, you must configure it with the second parameter; you can establish the % of the balance of your guarantee account (in the image, the yellow rectangle).
Here you have a video explaining the difference between the two ways, the fixed quantity an the equity percentage.
