There are two types of builds, normal build, and tiled build.
Normal build builds your terrain into a single image file, where tiled build breaks your terrain into a grid of tiles.
The first image you shared is of normal build resolution setting. This is the resolution your world is built at using "build" button. The second one is the tiled build setting. This is the resolution and build settings if you plan to build a tiled world, using "Tiled build" button (with a cross on it, like phillips screw).
Both are separate types of builds, so you can only build one at a time. The other settings do not affect the ones being currently used.
They are different things entirely. Render extents kinda define the extents of your world. By default, your main extent is your world, and you build it into "tiles", it just gets split into multiple pieces.
So in short,
1.) No, one does not negate the other, and
2.) Like I said, render extents have to do with your current world. So if you created a custom extent to isolate, say, a single mountain from a bigger terrain, say, an island, You will only split that one mountain into 8x8tiles on export. Make sure your whole terrain is your current render extent. If you did not change the extents anyway, just do nothing with regards to that. Just edit your tile settings and build tiled world.
The purpose of render extent is to go deeper and create most complex terrains you can imagine. It's like a "focus tool", so you can look at a biome closer. And it's used by the layout tool as well. If you don't wanna get into those, don't. It has nothing to do with tiling.
hi there I am very confused about the relatioship between the Render extents tab and the Tiled Build Options tab.
1. does one negate the need for the other. 2. if inside the Tiled Build Tab, I am making an 8x8 tile set at a custom resolution of 4033x4033 for UE4, do I have to do anything with regards to the Render Extents tab too.
Thanks in advance for any help you can give to me.