JupyterLab installed extensions and third party extensions in Discovery section are unvisible

Hi, I have problems with setting up JupyterLab.
I’ve done everything step by step, but missed something crucial, help pls.

everything is installed in my new isolated environment with the latest version of python and nodejs. I’ve also updated conda packages right after installing anaconda (got a recommendation in cmd)
Screenshot 2024-02-06 at 11.14.55