Is the environment variables COLUMNS set in your terminal? If so, try running
COLUMNS= ps aux | grep 'prepare-blob'

I think this is due to https://github.com/jupyter/terminado/blob/main/terminado/management.py#L210 - not sure if setting the LINES and COLUMNS environment variables are needed any more.

Thanks for opening this issue @satra! Do you happen to have any browser extensions enabled? I tried this myself in Arc and Firefox but I was not able to reproduce this in either but I may not be be accurately following the reproduction steps. Maybe attaching a video would also be helpful to make sure we are attempting to reproduce correctly.

i think this perhaps demonstrates the phenomena and relates to @holzman 's comment.

jovyan@jupyter-satra:~$ ps aux | grep jupyter
jovyan       296  0.0  0.0   6480  2360 pts/2    S+   03:27   0:00 grep jupyter
jovyan@jupyter-satra:~$ COLUMNS= ps aux | grep jupyter
jovyan         7  0.1  0.0 542636 151464 ?       Sl   02:56   0:02 /opt/conda/bin/python3.11 /opt/conda/bin/jupyterhub-singleuser --ip=0.0.0.0 --allow-root
jovyan       298  0.0  0.0   6480  2324 pts/2    S+   03:27   0:00 grep jupyter
jovyan@jupyter-satra:~$ COLUMNS=20 ps aux | grep jupyter
jovyan       301  0.0  0.0   6480  2320 pts/2    S+   04:47   0:00 grep jupyter
jovyan@jupyter-satra:~$ COLUMNS=200 ps aux | grep jupyter
jovyan         7  0.0  0.0 618432 151624 ?       Sl   02:56   0:03 /opt/conda/bin/python3.11 /opt/conda/bin/jupyterhub-singleuser --ip=0.0.0.0 --allow-root
jovyan       303  0.0  0.0   6480  2320 pts/2    S+   04:47   0:00 grep jupyter
jovyan@jupyter-satra:~$ ```

To remedy this problem option to disable changing the columns to more than available width of the viewport in terminal extension can be introduced. @satra would you say this would be helpful?

Such an option might need to be implemented in https://github.com/jupyter-server/jupyter_server_terminals and threaded down https://github.com/jupyter/terminado