title: Slideshow editing with Jupyter Lab
body: <p>The new <a href="https://github.com/jupyterlab/jupyterlab" rel="noreferrer">Jupyter Lab</a> is great, but I am missing the option to turn cells into slides. In classic Jupyter Notebooks, that was under "View > Cell Toolbar > Slideshow":</p>
  
  <p><a href="https://i.stack.imgur.com/YdY4S.png" rel="noreferrer"><img src="https://i.stack.imgur.com/YdY4S.png" alt="enter image description here"></a></p>
  
  <p>What happened to the feature? Is there a way to edit slides in Jupyter Lab?</p>