If your windows have a fill that is being changed by the renovation filter options or a background fill that is masking out elements below the window that you want to see on your plan, you can turn off the fills by changing them to the transparent pen.
In the Cadimage Window Selection Settings go to the Parameters tab, then scroll down to 9 Appearance. Next look for the Mask Pen settings and change this pen to 0(Transparent).
In Cadimage Windows/Doors for 17 there is only one Mask Pen, for AC18 you will have the option to have a background and foreground pen.
The result for both AC17 & 18 of changing the Mask Pen (Background Pen) to Pen 0 will be a sill view in plan that is transparent and will not be changed by the Renovation Override Styles.