title: How can I remove the Seaborn FacetGrid's legend title?
body: <p>I am using Seaborn's FacetGrid to combine many plots in one figure and I want to remove the legend title. For instance, in the example below, I want to remove the title "sex". </p>
  
  <pre><code>import matplotlib.pyplot as plt
  import seaborn as sns
  
  tips = sns.load_dataset('tips')
  
  g = sns.FacetGrid(tips, col= 'day')
  g.map(sns.lineplot, 'total_bill', 'tip', 'sex', ci = False)    
  g.add_legend()
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/t5aKI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/t5aKI.png" alt="enter image description here"></a></p>
  
  <p>I am aware of the discussion how to change the title in, e.g., <a href="https://stackoverflow.com/questions/57633621/how-can-i-change-the-seaborn-facetgrids-legend-title">How can I change the Seaborn FacetGrid&#39;s legend title?</a> However, I have not seen how to remove the legend title</p>