After having a brief understanding of the Outer Court, Mira's group began walking around to get a feel for the Sect, but they quickly realized that the Outer Court is massive!! For a place located in the middle of a mountain, they thought that it'd be similar to a mountain village, but they were wrong. Completely wrong.
No, the Outer Court is more like an actual city than a mountain village, at least in terms of size, but this wasn't without reason. For one, the number of Trial Disciples and servants living in the Outer Court is immense, much larger than the number of Outer Court Disciples.
There are already tens of thousands of Outer Court Disciples, maybe more. So, it goes without saying that the number of Trial Disciples is probably somewhere in the hundreds of thousands.
With so many people living in the Outer Court, it has to be large, or else nobody would be able to live here.