Chord Track not displaying chords

I’m just learning how to use Cubase Artist 9. I’ve been working through the Quick Start training video on the use of Chord Tracks (“How to be creative with VST instruments and Chord Track”)

I have created a midi track and recorded simple piano chords using a VST preset provided in Cubase 9. I’ve then created a Chord Track, and then selected Create Chord Symbols. According to the training vid the chords symbols are supposed to appear, but they don’t.

I’ve also tested this using Cubas Pro 9 trial version, and get the same result. What am I missing - I am following the training video to the letter.