How to delete worldborders in Minecraft?
Solution 1:
The world border is always present in a Minecraft world, even before the /worldborder command has been used. You can set it back to its default state (center 0,0 and width 60,000,000) by running:
/worldborder center 0 0
/worldborder set 60000000
Solution 2:
I am sorry, but that isn't possible. The world ends couple hundred blocks away from the world border.