By default, we expect to have a rather smaller number of entities types in a database. Unlike relational databases, where you typically see hundreds or thousands of tables, because everything gets dumped into a single database (and because a single document in RavenDB typically reside in many relational tables).
That said, we got a few complaints about this story, because the studio UI becomes hard to use when this happens. We decided to support it in an interesting fashion. This is what your documents will look like when you have ~60 entities types in a single database:
And here is where you go if you have hundreds of them. Psychedelic days are here again!