Clearance traces to ground after executing groundfill

Is there a way to change the distance between ground and traces after executing
Ground Fill? I have some traces which carry 300Vdc to ground and want to increase the clearance between those traces and ground. Yes, I know I can decrease the trace width after
the Ground Fill, but can’t I change the clearance by changing some parameter in fritzing?



After set the desired value, you’ve to clear previous copper fill, then re-fill to update…

That’s it!!
Blue, this solved my problem.