Use the Options area to see and change the settings for fill angle, underlay and compensation.
The angle of the fill pattern, as shown by the arrow. The thread is at a right angle to the fill pattern. Set the Angle from 0 to 359 degrees. The initial setting is 0.
The fill angle will also affect the orientation of the gradient. You can also change the fill angle with the handle on the Origin marker 
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Choose from None, Low, Medium or High density underlay. Underlay is a low density fill that is perpendicular to the stitches of the actual fill area. Underlay is useful for stabilizing large fill areas. Underlay is initially set to Low.
Underlay stitches are not generated for areas using gradient density, although the property can be selected in case you switch the area back to a standard density area.
Compensation is used to make an area 'bolder' by increasing its relative size. Set Compensation from 0 to 20. The higher the number, the bolder the area appears. The initial setting is 0.