ReadyAPI 4.0.1: How to see overview of open messages

In previous version of ReadyAPI I saw a tab for each in editor opened message. It was easy to switch between messages by clicking on tab headers.
It looks like this has been changed with version 4.0.1.

Now it it is difficult to change between open messages using button 'Go back' and 'Go forward' because i am missing an overview.

Is there some setting so i can see an overview of opened messages?