On 4.20 it’s still bugged - white camera preview and missing shadows in camera mode. I really, really need working orthogonal camera for 2D RPG isometric style environments. I’m aware that not many people need it, therefore bug has low priority. But I think it has been 4+ years of unfixed bug. Wouldn’t a skilled Unreal programmer solve it in pretty short time?
Even if it’s low priority, this orthogonal camera is very useful for Archviz, which I believe, is large part of UE4 users. These orthogonal views are commonly used in presentations, like side and top views of house.