Someone better versed in history is free to correct me, but from my understanding it’s largely about the powers involved and how central they were.
Many wars have conflicts and participants not from the same continent in some capacity, and most of the powerhouses and main nations/conflicts were still Europe-centric for the 7 years war tmk. Powers based in the Americas weren’t really that relevant yet and it was more an Americas theater for European powers to fight in.
Meanwhile in the WWs, major powers from the Americas and Asia played a much bigger role in a more independent capacity, with many conflicts being entirely outside of European influence/theater/power involvement, but still rooted in the same war. E.g. USA v Japan.
Granted at the time, WWI wasn’t termed a world war, but The Great War. It didn’t become known as one of the world wars until afterwards/there was another conflict of a comparable scale.
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