I couldn't fix the U-shaped elevator curtain

[mgondem]

Hello. There is a u type curtain in my attached project. According to the regulation, it is necessary to model the polygon as a column. But I remember defining it as Curtain and creating a group as the recommended solution method. However, I could not fix the u-shaped elevator curtain in the project. I would be happy if you were half. Have a good work everyone If there are other shortcomings in the project, I would appreciate it if you warn me