Unfortunately, you can not get a map of the world in a single step.
To generate a map of the world you need to run Real World Terrain many times, each time generating a small area (for example, 5x5 degrees).
But in any case, I think it's a bad idea. This will have a huge size (several gigabytes), and have a poor quality. If you try to increase the quality, the size will increase exponentially.

Please explain more what you want to do.
Perhaps I'll give you some tips on how to achieve your goals.

Coordinates (1, 0) - (0, 1) are in the Atlantic Ocean.
Most likely for these coordinates are no elevation data and tiles.

The document says it is stored in RWT_Results but got no idea where that is.

I don't see any folder named RWT_Results on the inspector.

I am trying to get the world map.

maybe it's the size of the map I am trying to get?

So I tried 1,0, 0,1 instead and still happens the same thing. nothing comes up.

Can someone help me get this started with?