title: Navigate to def's in PyCharm
body: <p>At the left side of PyCharm, where I have my project and filenames, I was till recently able to "fold open" a Python file like it was a directory and here I saw all classes and defs. This way I was able to navigate very easy.</p>
  
  <p>A few days ago this suddenly stopped; now I just see the files and no longer the defs and classes.
  I went through the entire list of settings (my god) but am not able to find how I can enable this... and without this option, I scroll myself an RSI.</p>
  
  <p>Anyone an idea where this is hidden?</p>