/gamerule mapgrid

For both Minecraft Java and Minecraft Bedrock edition infinite worlds only.

Allows users to specify how map grids will be created per world

/gamerule mapgrid <parameter> <x> <z>

parameter, takes 3 valid answers: "center" "border" "nogrid"

"center" will have maps all map zooms, center at x and z indicated, and then the map grid will be created like that

"border" will have maps all map zooms, have border at x and z indicated, and then the map grid will be created like that

"nogrid" will NOT take an x or z parameter, and maps will zoom out from the level 0 map in all directions equally.  level 0 maps are created to the nearest chunk multiple of 16.

x and z takes a valid multiple of 16 integer from -1024 to +1024 inclusive, any other integer not allowed