So I changed the device type to a “centralite dimmer” and unfortunately the result is that the actions ON/OFF in the SmartThings App do not result in the engine turning right OR left physically.
So I believe the hardware Enerwave Motor Controller (Model: ZWN_MCM-AC) is not compatible with the CentraLite Dimmer Device Type.
Just to make sure I followed the right process:
On https://graph.api.smartthings.com/ide/devices I clicked on [+ New SmartDevice]
I selected tab [From Template]
I selected [CentraLite Dimmer]
I clicked on [Create]
I clicked on [Set Location]
I selected for ‘Choose a device to test with’ [Enerwave Shutter Relay]
I clicked on [Install]
I clicked on [Publish] > [For Me]
I clicked on [Save]
I tested whether the hardware and updated software configuration would pair by unplugging and replugging the power to the SmartThings Hub and the Enerwave Motor Controller.
It unfortunately did not.
I created a New SmartDevice and followed the same above steps but now for Dimmer Switch (the original auto-selected Device Type initially).
After unplugging and replugging the power to the SmartThings Hub and the Enerwave Motor Controller I was able to control the Enerwave Motor Controller as per original configuration:
On = Turn Right
Off = Turn Left
As a side-remark, I believe I read user Aracaneshark experience the same problem as me, but with the Fibaro FGRM 222 - Roller Shutter: