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You need to correctly set skins in the Composites Dialog.
When displaying it on the Floor Plan, use line types and pens of composite and turn on True Line Weights.
Laszlo
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28