This option can be chosen by going to the 'Advanced' section and choosing "Flat" world type when creating a new world.
A Superflat World, as the name suggests, is a world consist of a completely flat world with no terrain. They have the following features:
- The World is made of 1 layer of Grass Blocks, 2 layers of Dirt, and a layer of Bedrock.
- The World is Infinite by default.
- The World is locked on Creative by default but can be switched to Survival later.
- No Generated Structures (Villages, Lava Pools, etc) spawn.