Where are my Night Shift options?

What is the magic incantation to get the "Night Shift" options to appear in the Sys Prefs Display pane?

I've hooked up a 42" LG 1080p display to my Mac Pro via HDMI<-->HDMI, and the Night Shift options do *not* appear in the Sys Prefs Display pane.

If I hook it up with a Thunderbolt2<-->HDMI cable, would that do the trick? (I would have to buy such a cable to try it out.) Just wondering what triggers the options to show up. (Mojave 10.14.6)

-Carl