I'm trying to modify the main menu of jupyter lab through jupyterlab extension. What I want to do is to remove or collapse all tabs into one. As I didn't find any explanation on that I tried to follow a tutorial to work with menu tabs: https://github.com/jupyterlab/extension-examples/tree/master/main-menu
However, I'm not being able to reproduce it. I run these commands on the terminal (inside the main-menu folder):
python -m pip install -e .
# install your development version of the extension with JupyterLab
jupyter labextension develop . --overwrite
# build the TypeScript source after making changes
jlpm run build
# start JupyterLab
jupyter lab
But the "Main Menu Example" tab never appears.
What could it be? some cache information that I need to clean?