Does the parent stay mounted when navigating between child routes?
Yes. When the URL matches a child route, React Router renders the parent layout and the child inside the Outlet. The parent stays mounted across child navigations, preserving its state.
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More FAQs in What Is the Outlet Component in React Router and How to Use It
Outlet is a placeholder in a parent route's component where the matching child route renders. The parent renders the shared layout, and the child renders inside the Outlet, so you define the layout once for all child pages.
Without Outlet, you would repeat the header, sidebar, and footer in every page. Outlet lets you define the layout once and let child pages render inside it, which keeps your code DRY and the layout consistent.
Create a layout component that renders the shared UI and an Outlet, then define it as the element of a parent route and nest child routes inside that parent. The matched child renders in the Outlet.
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