It's still somewhat early days. There's a card [1] on the feature requests list for making ".." configurable. The reason it's not there by default is that I want to keep the UI as clean as possible. But if you vote on the card (like many others have), then the implementation of this feature will be moved up in priority.

[1]: https://trello.com/c/i3iA6BFZ/2-entry-in-folders