You might be wondering how to work the preset part of the customize flatland button. Well all you have to do is go into the customize flatland menu then go into the presets tab and then you will see something like this:
Now you may not know this but each block has a special code. The codes are in order in the creative mode inventory. Dirt is the 3rd thing in the creative mode inventory in the search tab without searching anything so its id is 3. Stone is the 1st so its id is 1. Got it? Now in the number tab below don’t fiddle with the 1 or 2 just the change the numbers to different ids. For example I could change 1:7,2×3,2:2 to 1:7,30×1,2×3,2:2 which would add 30 stones under the dirt. Its so cool (once you learn how to do it).
Minecraft presets are good for:
2. making backdrops
3. making adventure maps
4. lots of other stuff