Adding Expansion to a Xbox server.

Unfortunately this is how the game was designed. If you wish to add more grids/expansions they are an additional server to be purchased.

You can use Server Grid editor to custom make a map with what ever island you would like, like the PVE islands for boss fights. This will add more depth into a single server than just the regular freeports or grid based islands. Just be careful not to add to many as your game will crash. Be wary the maps aren't currently working on xbox atm.