Per another thread, because my games run in Full Screen Windowed Mode - they are not detected correctly by DisplayFusion.
The workaround stated was to add a compatibility rule and force the application to be treated as full screen. This does work, but it causes the other Displayfusion taskbars to flicker.

Is there any way to alleviate the flickering? It's rather distracting... For the time being, I've taken to simply disabling the taskbar on my middle screen, but that's just not ideal.