title: Sklearn plot_tree plot is too small
body: <p>I have this simple code:</p>
  
  <pre><code>clf = tree.DecisionTreeClassifier()
  clf = clf.fit(X, y)
  
  tree.plot_tree(clf.fit(X, y))
  plt.show()
  </code></pre>
  
  <p>And the result I get is this graph:
  <a href="https://i.stack.imgur.com/fZOxU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fZOxU.png" alt="enter image description here"></a></p>
  
  <p>How do I make this graph legible? I'm using PyCharm Professional 2019.3 as my IDE.</p>