You can modify the density using the 
scale value of 
hatch pop-up window. for hatches, already done, use 
properties and click on the hatches then 
hatch pop-up window appears.
To make the lines larger, then you should change the line 
width of the layer holding the hatches.
Same if you want to change the color of hatches.
	
	
	
				Fabrice
French hobbyist interested in 2D design.