It should be a case of WYSIWYG (What You See Is What You Get).
In your Archicad plan set the pen thickness option ON.
Then you can control your lines and fills with the 'Display Order'.
Bring some forward and send some back to get them looking how you want.
It can be a real juggling act at times and you still may not get the results you want.
If not add an extra line on top.
A thick line can hide a thin one, but a thin one can not hide a thick one.
Also an empty fill with a white or windows colour background can be used and you can turn the perimeter lines off for the fill as well.
A fill with no perimeter will only cut half of the thickness of a line below it if they share the same edge.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11