API Reference > ui-framework > Frontstage > FrontstageProps > topMostPanel topMostPanel topMostPanel: undefined | ReactElement<StagePanelProps, string | JSXElementConstructor<any>> The StagePanel on the very top across the full width. @beta @deprecated Only topPanel is supported in UI 2.0 Defined in ui/framework/src/ui-framework/frontstage/Frontstage.tsx Line 90 Last Updated: 12 June, 2024