Color Layers using Masters no Preview

Hi, I’m trying to make a two-color font and I’ve been having some difficulty.
I’ve been following this article but I’m still not able to preview both layers at once. In the Fonts window, I can only view each layer separately. I would appreciate being able to see the layers together. I would love any help. Thanks.

Where do you expect the preview? In font view, it could indeed show all colors. I see what I can do.

In edit view, have you check the eye symbol in the layer panel. All eyes need to be “open”.