roof over stadium seats

I was wondering what setting caused the removal of the roof of the stadium (see picture) (I mean the cover of the seats, not the roof like f.e. wembley)

The roofs are designed to be absent or transparent whenever they block the view off the pitch

TY for the reply,

I know that, but I used to see my roof (stadium is the same), but it seems it's gone since a while. Was wondering if there was a setting to it or not.