Toolbar not visible after setting jupyter notebook theme

Question

The toolbar and notebook name does not show when I call and load the themes from the notebook.

I can load the themes from notebook using a code but I am not sure how to

Answer 1

I was able to solve this by editing the custom.css file located at ~/.jupyter/custom/custom.css. I changed the mailtoolbar setting from ’none’ to ‘block’. i.e. find this line:

    div#maintoolbar {
        display: none !important;
    }

...and change it to:

    div#maintoolbar {
        display: block !important;
    }

Hope that works for you too! Don't imagine looking for reasons it failed to start with, however, there is a theory one cannot update while it is running.