My problem is quite strange, since I think I set all possible settings right, but the problem is still there.
On all my plans I want to show Demolished Elements as pale blue outlines, which means that the elements should be overridden of a transparent background fill. So I ticked transparent fill in Document>Renovation>Renovation Filter Options.
I also set Graphic Override Rules for demolished elements the way I want them to show up, everything ticked I guess, but still, it is not showing up the way I want it. I also don't want to draw lines manually to overcome this issue.
As you can see on the attached picture I have shadows and other stuff showing up that are demolished, e.g. the fill of the roof has a dashed blue outline, because that's a demolished fill, but still shows up and creates this mess. The same happening on the Sections, but the Floor plans are somehow ok.
I'm not sure that I pick up every issue you have here (could you perhaps explain "the other stuff").
But regarding the shadows in the elevation - they shows simply because you through your elevation settings have shadows enabled and through your renovation filter has demolished items set to shown (albeit overridden).
Other Stuff = walls, roofs, objects, fills, etc. that are set to be demolished, and should be transparent, yet are still visible.
So you say, that if I want shadows of New and Existing elements to show up and transparent fills with blue dashed lines for Demolished, then I need to manually draw those lines and forget about showing Demo elements, because this is how this software works, I guess?
Your Reno settings are correct, but it will only work fine with plan vues.
The problem with sections and elevations vues is that they are calculated from 3D model.
In your case Element to be demolish are visible so they will generate shadows.
Only some objects have a parameter to disable shadows.
So as a workaround, the only way to force Roofs, Walls and other to be demolished element to not generate shadows, is to create specific layers for them. Then you can create a view where those layers are set to "Wired frame" as elements in a "Wired frame" layer doesn't generate shadows.