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

Currently, in a component's render, you can only return one node; if you have, say, a list of divs to return, you must wrap your components within a div, span or any other component.

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.