Solid Wall in Imported Door Opening

[Mr_Kingsbury]

I absolutely do NOT want the furniture library that comes with the software, so I deleted it; it screws with my OCD. But now when I import doors, even from the default furniture, it shows a solid wall within the doorway instead of an opening. I did tick "door and window", and the depth is more than that of the wall. How do I fix this?

[Puybaret]

Maybe you should read this thread.
By the way, I have no idea about what OCD could mean.