Which setting can be configured from map and scene defaults?

The configuration of a default extent from map and scene defaults is essential in establishing the initial view for users when they first open a map or scene. By setting a default extent, administrators ensure that the map or scene opens at a specific geographic area, which enhances user experience and accessibility to relevant data.

When users access the map, the default extent automatically determines the visible area without requiring them to navigate manually. This is particularly useful for applications aimed at a specific region or project, allowing users to immediately see the context of the data presented.

The other options focus on different functionalities within the ArcGIS Online environment. The default map viewer pertains to the choice of viewer interface rather than the geographic starting point, app templates deal with the overall structure and functionality of applications, and 2D web style groups involve the visual representation of data, but none directly affect the initial geographic extent seen by users. Thus, the ability to configure a default extent stands out as a unique and critical feature in the context of improving user interaction with maps and scenes.