Jupyter lab sidebar damages after installing an extension

Question

I'm trying to install TOC extension for Jupyter lab.
The issue is the same for both ways of installation:
from the command window or from the extension manager.

1. I'm installing an extension using the command:

   jupyter labextension install @jupyterlab/toc
   

2. I have to build jupyter lab using:

   jupyter lab build
   

3. Icons from sidebar disappearing like in this issue.
   Here is the screen:

And I cannot return to normal view unless I reinstall Anaconda.
What can I do for correct work? How can I return to correct build of Jupyter Lab?

Answer 1

I will suggest upgrading to the latest version of Jupyterlab. I was having a similar error as mentioned here https://github.com/jupyterlab/jupyterlab/issues/7158 and the problem has disappeared after I upgrade from 1.0.2 (as per anaconda package) to 1.1.2.

Good luck and I hope this will solve your issue.