Regions are not tied to world size. They are something that gets spat out by the world gen linking similar biome types. The worlds are the same number of plots/blocks wide. If you select a creative 6km world and only pick 1 biome you get 1 massive region.
Edit: reference
the regions dont have a defined size, they are what they are. if worlds have a similar number of unique biomes for the same world size, the regions will work out to be the same size.
if you make a creative world with just 1 biome… the entire world will be the centre of 1 region!
“Some of them” may by chance end up not selected if you really put too many in, but generally yes; you just get noisier/smaller areas of each biome (*)
In the case of creative worlds, there is no weighting of the tiers so they will largely speaking be shoved in equally (some biomes internally specifying biases to their weight to make them a little larger/smaller which is respected by the generation system; but ignoring that).
in the case of sovereign worlds, where it asks you to say: “select a…
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