App Interface Guideline: State — Preserve Screen State. Keywords: navigation preserve state. Platform: iOS/Android/React Native. Description: Returning to a screen should restore its scroll and form state. Do: Keep components mounted or persist state. Don't: Reset list scroll and form inputs on every visit. Good Example: <Tab.Navigator screenOptions={{ unmountOnBlur: false }}>. Bad Example: <Tab.Screen options={{ unmountOnBlur: true }} />. Severity: Medium.