Where can users switch between Standard and Maplex labeling engines in ArcMap?

The Labeling toolbar in ArcMap is the correct location for users to switch between the Standard and Maplex labeling engines. This toolbar provides real-time access to various labeling options, allowing users to easily toggle between labeling engines based on their project needs.

Using the Standard labeling engine offers basic labeling functionality, while the Maplex labeling engine provides advanced features like better text placement, conflict resolution, and more customization options for label formatting. The ability to switch engines directly from the Labeling toolbar allows users to enhance the visual quality of their maps without navigating through multiple menus or properties.

The other environments, such as the Layer Properties, Database Properties, and Map Document Properties, do not provide the direct functionality to switch between the labeling engines. The Layer Properties section may include some labeling settings, but it does not offer the choice of switching between engines, making the Labeling toolbar distinct in this capability.