Online Region Max World?

[sly goblet]

I have a Question or a Problem i dont know for anyone i Uploaded a region for me and my family to play but there are only 4 maps rn but i need more worlds so how can i get up to maybe 6 maps or more cause i saw that others have over 90 to 140 !so please help me

[red oxide]

Press one of the tiles on the minimal during world generation and press split