What is the first setting to adjust if an organization wants a custom map extent for all users?

Adjusting the map and scene defaults is crucial when an organization aims to establish a custom map extent for all users. This setting provides a centralized approach to defining the initial display and extent that everyone sees when opening a map within the organization. By modifying these defaults, administrators can ensure that all users start with the intended view, which may be particularly beneficial for guiding their focus to specific areas of interest or for consistent presentation across various projects.

Therefore, changing the map and scene defaults directly influences how maps are presented to users, thereby fulfilling the requirement for a custom map extent organization-wide. This can help create a uniform experience, ensuring that everyone is looking at the same geographical context, which can improve collaboration and understanding among users.

On the other hand, while other settings such as the default basemap, web styles, and map viewer settings play important roles in configuring various aspects of a map, they do not specifically address the custom extent that all users will see. The default basemap focuses on the layer visibility and styles, web styles concern appearance and aesthetics, and map viewer settings mainly refer to functionalities available to the user when working with maps. Thus, they do not achieve the same broad and foundational impact on the initial map extent across the organization.