The only solution I have:
After you placed the Skin List Label, go to the Custom Settings Panel and activate the Custom Content page.
Check the "Custom Content" checkbox and then you will be able to edit the skin list. The list will contain the current skin list so it is not hard to modify it.
If you modify the Wall Structure, you will have to update the list. The fastest way is probably to select another Label type, then select the Skin List Label again, because only then will the list of skins update in the Custom Settings panel.
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