Old Customized – Minecraft Wiki

Customized, retroactively labelled Old Customized by later game versions, was a world type that replaced the normal varied terrain of the Overworld with custom features. Because, as of snapshot 18w06a, it was removed completely due to the rewrite of the world generation, it was then replaced by a new, easy-to-customize but considerably more limited substitute world type called Buffet. Custom worlds returned in 20w21a, though they are completely different; this version also renamed this world typ

Minecraft - Wikipedia

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Old Customized – Minecraft Wiki

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What are world types in Minecraft?