Side Menu in Doxygen
<p>currently I am trying to create some documentation using doxygen. I wish to use the side menu instead of the top menu, I think it looks better. The issue is that it does not create it. </p>

<p>From the <a href="http://www.doxygen.nl/manual/customize.html" rel="noreferrer">doxygen documentation</a> I found that to use the side menu instead of the top one I must set:</p>

<pre><code>DISABLE_INDEX = YES
GENERATE_TREEVIEW = YES
</code></pre>

<p>Unfortunately, the moment that I do this the top menu does disappear but the tree menu on the side is also not there. </p>

<p>The layout defined by navindex on my XML is the following:</p>

<pre><code>  &lt;navindex&gt;
    &lt;tab type="mainpage" visible="yes" title=""/&gt;
    &lt;tab type="pages" visible="yes" title="Manuals" intro="List of related manuals:"/&gt;
    &lt;tab type="modules" visible="yes" title="References" intro="List of related references:"/&gt;
    &lt;tab type="namespaces" visible="yes" title=""&gt;
      &lt;tab type="namespaces" visible="yes" title="" intro=""/&gt;
      &lt;tab type="namespacemembers" visible="yes" title="" intro=""/&gt;
    &lt;/tab&gt;
    &lt;tab type="classes" visible="yes" title=""&gt;
      &lt;tab type="classes" visible="yes" title="" intro=""/&gt;
      &lt;tab type="classindex" visible="$ALPHABETICAL_INDEX" title=""/&gt; 
      &lt;tab type="hierarchy" visible="yes" title="" intro=""/&gt;
      &lt;tab type="classmembers" visible="yes" title="" intro=""/&gt;
    &lt;/tab&gt;
    &lt;tab type="files" visible="yes" title=""&gt;
      &lt;tab type="files" visible="yes" title="" intro=""/&gt;
      &lt;tab type="globals" visible="yes" title="" intro=""/&gt;
    &lt;/tab&gt;
    &lt;tab type="examples" visible="yes" title="" intro=""/&gt;  
  &lt;/navindex&gt;
</code></pre>

<p>Which I know does work because it worked as top menu. Also, I see no error during the document generation.</p>

<p>I was wondering if somebody could give me a hint regarding something that I might be missing to make the side tree work.</p>

<p>Thanks in advance!</p>

<p>BTW I am using doxygen 1.8.11</p>