title: x axes titles on subplots Plotly Python
body: <p>I am trying to add the <strong>same titles</strong> on the <code>x-axes</code> and <code>y-axes</code> to four gantt charts that are displayed as subplots. I found online <code>figs.update_layout()</code> however, this only presents the title on the first chart, not all. I have found a few answers with R however any help with python would be great</p>
  
  <pre><code>figs = make_subplots(
  rows=2, cols=2,
  shared_xaxes=False,
  subplot_titles =('Plot 1', 'PLot 2', 'PLot 3', 'Plot 4')
  )
  figs.update_layout(
      title="Plot Title",
      xaxis_title="Miliseconds",
      yaxis_title="Services",
  )
  
  for trace in fig_operable.data:
      figs.add_trace(trace, row=1, col=1)
  for trace in fig_dynamic.data:
      figs.add_trace(trace, row=2, col=1)
  for trace in fig_early.data:
      figs.add_trace(trace, row=1, col=2)
  for trace in fig_hmi.data:
      figs.add_trace(trace, row=2, col=2)
  
  figs.update_layout(showlegend=False, title_text="Title of charts")
  figs.show()
  </code></pre>