title: Holoview plots do not show/appear/display in jupyter notebooks
body: <p>I'm trying to make a Holoviews Sankey plot in Jupyter notebook (running Jupyter notebook using Pycharm), but the Sankey plot does not appear after the block is executed.</p>
  
  <p>First I import required packages and set 'bokeh' as Holoviews extension. Using holoviews 1.10.9 and jupyterlab 0.35.4.</p>
  
  <pre><code>import pandas as pd
  import holoviews as hv
  hv.extension('bokeh')
  </code></pre>
  
  <p>After performing some data wrangling, I prepare a dataframe 'private_investments_grouped' with 3 columns (source, target, value). </p>
  
  <p>I then execute the following code to make the Sankey plot for a sub-dataframe:</p>
  
  <pre><code>hv.Sankey(private_investments_grouped.loc[1:7]).options(label_position='left') 
  </code></pre>
  
  <p>No plot appears in the output block, no pop-ups, no error messages. It appears the code executes, but no visualization appears.</p>
  
  <p>I can use the 'bokeh' renderer in a Python file in Pycharm and store the Sankey plot as a html file, which works fine. However, I'd like to see the plot in Jupyter notebook.</p>