Support structure never changes in cura configuration

When i try to change parameters in cura configuration structure for over angle and fill structures, those changes have no effect on the realised support : it is always a grid with 4 millimeters intervals . even on the preview on repetier i see the same support without changes.

in that case , i think it is no possible to create an horizontal top over this structure…
i want to increase the fiiling parameter to 50% …

Thanks for your help.