I uploaded the image too.
It’s worth mentioning that setting the global section fill settings for the VirtualArq Section Tool didn’t work to apply a specified fill colour globally, but Rhino’s clipping plane eventually worked globally (as described below) to apply a chosen colour on all of them except the one with a material applied. (Which is where I really need it to work, unfortunately.) I hope the project allows you to find a solution. Setting them for each object individually won’t really work, and I still need them to display with Layers visible as set in Wall Styles, in Plan View.
It’s also worth mentioning that the solution on the Rhino forum (in one place) of applying a fill pattern and colour to a Clipping Plane didn’t work for me (as it has not worked for others reporting on the forum in other places) for adjusting the colour of a global fill (or anything else) on all Clipped Planes. The only thing that worked was setting a custom property for Clipped Plane display in Preferences for Render View Mode - but that did not work (only) for the Wall with a material applied.