Here’s the “Side Scroller Template” example project from UE 4.17.1, with an orthographic camera:
You can barely make out the platforms. You can’t even tell that the character is standing on something!
I tried building the light (light quality set to “Production”) and not even the “baked” shadows show up. Theses “baked” shadows are supposed to be greyscale textures placed on UV Channel 2, right? Then why aren’t these “textures” being displayed in orthographic view?