I probably don't have exactly the same object as you so this may not be exactly the same but in the parameter list in the object settings you should see controls for the fill pen colours.
Barry.
One of the forum moderators. Versions 6.5 to 27 i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10 Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11
Thank you Barry for the response, but my parameter list doesn't show the grey fill for me to be able to change it. I also have this grey fill on my levels that I can not get rid of.