Scala Worksheet returning no output results

I am very new to Scala and have been following a coursera video. I've just created a new Scala worksheet and entered in a simple query/code:


Nothing is returned on the right hand side like it shows in the video and on every community board/website.


Not sure how/what to troubleshoot.

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I have similar issue. 

IntellliJ IDEA Ultimate 2019.2.3, running on MacOS Mojave


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