toman,
I suppose you would like to achieve that graphical look that is usual in English-speaking countries where there is a thick outline to all cut elements and all other cut lines are thin lines.
Unfortunately, this is not possible currently.
The screenshot you uploaded has two structures intersecting. The intersection of each skin of each structure is based on the Intersection Priority Numbers of their Building Materials, the skin with the higher Intersection Priority Number cuts the intersecting skin.
Unfortunately, the Pens that you set in the Composite Settings Dialog are applied along the whole edge. This is why the thick outline of the Wall does not stop at the top of your floor, but continues downward as long as that skin goes based on the Intersection Priority Numbers.
So you would have to use some workaround to achieve the desired look.
1. Use a thin Pen and place thick line segments wherever you need.
2. Cover the short thick segment with a Fill and draw over it with a thin Pen.
Neither is a good solution, but achieves the desired look.
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