title: Can't find the Kotlin REPL sidebar
body: <p>I'm a newbie and under a Kotlin REPL session. But <strong>I couldn't find the sidebar</strong> which shows the red circled exclamation marks or green triangles. Here are the pictures I'm talking about:</p>
  <p><a href="https://i.stack.imgur.com/urwFp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/urwFp.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/Q2FVJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Q2FVJ.png" alt="enter image description here" /></a></p>