I am aiming to present vertical/horizontal sections through building in a simple and clean way. Ideally I want to have merged all cross sections into solid fills. (using Advanced Properties) As you can see now it is one big mess! Only the regular Section viewport with orthogonal and oblique view (never mind dormer details - not fully finished yet) is working fine. Perspective view loses most of fills (walls/slab/roof...) while in horizontal section VP windows/doors openings are not always r