I currently have a massive object (5 km x 5 km) with a material. The material renders perfectly fine (albeit at very low quality) when close up; but when I get the camera far enough away to see it all at once the material starts flickering and then just vanishes.
I am using the default top down character so you can see how far out the camera is.
I currently have the texture applied to an actor and can’t find the menu you have shown. (isn’t that menu only for static meshes?)
I have also found that applying the texture to a static mesh that is big enough to see that far away doesn’t have the same problem as I stated above and works (mostly: the texture isn’t mapped right) flawlessly.
Static mesh is is placed in the space with actor, you can change the static mesh properties assigned to the actor, by clicking here :
Double click on the static mesh thumbnail and you will get the same window as I got in the first screenshot.
You may look into the documentation for UE4 from Epic, like there :
Sometimes its hard to find what you need in those documentations, but all in all they are comprehensive guide to the UE things. I know that UE allows you to jump into the engine and start having fun, but all in all, it is a complicated engine and you will need a manual for sure.