Common
```kotlin @ExperimentalMaterial3AdaptiveApi sealed interface PaneExpansionStateKey ``` Interface that serves as keys to remember and retrieve [PaneExpansionState](/jetpack-compose/androidx.compose.material3.adaptive/adaptive-layout/classes/PaneExpansionState) with [rememberPaneExpansionState](/jetpack-compose/androidx.compose.material3.adaptive/adaptive-layout/composable-functions/rememberPaneExpansionState).