title: How to add a legend after arrange several plots using `ggarrange` from the ggpubr package?
body: <p>I have got to create this arrange of different plots using <code>ggarrange</code>:</p>
  
  <pre><code>arrange &lt;- ggarrange(P1,P2,P3,P4,P5, ncol=3,nrow = 2,common.legend = F, align = c("hv"))
  arrange
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/zjwWU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zjwWU.png" alt="enter image description here"></a></p>
  
  <p>I would like to add a common legend, so I did this:</p>
  
  <pre><code>arrange &lt;- ggarrange(P1,P2,P3,P4,P5, ncol=3,nrow = 2,common.legend = T, align = c("hv"),legend="top")
  arrange
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/NxPcJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NxPcJ.png" alt="enter image description here"></a></p>
  
  <p>However, I would like the legend was in the right lower part of the graph, in the "blank" space.</p>
  
  <p>Do you know how could I do this?</p>