Everything is adjustable: base map size, globe size, queue character size, event size. There's a scaling control for each of these elements in the parameters, so you can create anything from a tiny planet (like King Kai in DBZ) to the classic RPG Maker world map size.
Naturally, very large and detailed worlds will require more processing resources and may cause FPS drops. There are ways to simplify resources and turn lighting on or off to work around this.