You can save a template file that Archicad can use when creating a new file.
Set up the pen sets, layers, materials, etc. as you want and then save the project as an Archicad template file (.tpl). When you create a new file, click on the template list and select browse templates. Find the template file that you created and open it. It should appear as the default template from now on.
iMac 27" 5K • macOS 10.15.7 Catalina • 40GB RAM | ArchiCAD 24 5004 FRA
Ryzen Threadripper 3970X • Windows 10 • 64GB RAM | ArchiCAD 24 Solo UKI