Jupyterhub default user interface is not notebook?

jupyter hub version:2.2.2
how can i change the default user interface to be notebook.
i changed the config value:
c.Spawner.default_url = ‘/tree’ seems not work, and it still the lab interface

thks!

Hi Seven,

In the Jupyter notebook container set the environment variable:
JUPYTERHUB_SINGLEUSER_APP=‘notebook.notebookapp.NotebookApp’

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