Above issue occurred due to jupyter --version . I have update the jupyter version in docker file to RUN pip install jupyterlab==3.1.0a5
And RUN below command in docker file too
RUN jupyter labextension disable @jupyterlab/docmanager-extension:download
&& jupyter labextension disable @jupyterlab/filebrowser-extension:download as stated by ncgoodbody in above discussion . This changes disable the dowload functionality and right click download