Improve visual representation of notebook structure

Maybe that’s just me but I find the representation of the notebook structure somewhat confusing as is sometimes difficult to tell at first glance which sub-notebook belongs to which notebook especially when there’s lots of layers. Displaying the notebook structure as a tree might help.

Example for reference:

├── Notebook1
│   ├── Notebook11
│   ├── Notebook12
│   ├── Notebook13
│   └── Notebook14
├── Notebook2
└── Notebook3
     ├── Notebook31
     └── Notebook32
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