How to close Jupyter Notebook Session in DSS?

[UserBird]

The Jupiter Notebook Session refuses to terminate upon clicking "X": It results in "Unknown error HTTP code: 404, type: unknown". This is likely resulting in "insufficient memory" errors when many Notebook Sessions are open.

[Clément_Stenac]

We confirm this is a bug in version 4.0 - To unload the notebook, go to the notebook itself, and select File > Close and Halt