react.dev/cookbook/05-jsx-root-node-count.md

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jsx-root-node-count	Maximum number of JSX root nodes	cookbook	jsx-root-node-count.html	self-closing-tag.html	style-prop-value-px.html

Problem

You're getting a parsing error from JSX.

Solution

You might have tried to return more than one node in your component's render. Currently, you can only return one node, meaning that you must wrap your components within, say, a div or a span (or any other component).

Discussion

Don't forget that JSX compiles into regular js; returning two functions doesn't really make syntactic sense. Likewise, don't put more than one child in a ternary.