Side bar is not showing up

[WesErg]

I have update jupyterlab and the sidebar for TOC is not showing up.

Here is my extension list:

I am afraid I can't figure out what else to do.

[msjoules]

I had the same problem. These were the steps I took to solve it:

1. Update Node.js using the conda-forge package as the conda Node.js package only goes to 10.x
2. Delete build_config.json from ...\share\jupyter\lab\settings (https://discourse.jupyter.org/t/extension-shows-up-as-both-installed-and-uninstalled-and-doesnt-work/2688/2)
3. Pull up jupyterlab extension list again and it should say "Build recommended, please run jupyter lab build:"
4. Run 'jupyter lab build'

Hope that works for you too...