API Reference > presentation-backend > Core > PresentationManagerProps > activeUnitSystem activeUnitSystem activeUnitSystem: undefined | PresentationUnitSystem Sets the active unit system to use for formatting property values with units. Default presentation units are used if this is not specified. The active unit system can later be changed through PresentationManager or overriden for each request alpha Defined in presentation/backend/src/presentation-backend/PresentationManager.ts Line 206 Last Updated: 11 June, 2024