title: Hide the cell tag panel in Jupyter Notebook
body: <p>Jupyter notebook has a new feature of cell tags since version 5.0 as described in the <a href="http://jupyter-notebook.readthedocs.io/en/latest/changelog.html#notebook-version-5-0" rel="noreferrer">changelog</a>.</p>
  
  <p>I activated the cell tags going to <code>View &gt; Cell Toolbar</code> as described on their page.</p>
  
  <p>How can I deactivate this little panel on the cells?
  Pressing the same button again doesn't help.</p>