To allow users to select values for certain attributes in a web app, what action should a GIS analyst take?

To enable users to select values for certain attributes in a web app, defining geodatabase domains and sharing them is a crucial step. Domains provide a way to restrict attribute values to a predefined list or range of acceptable values, enhancing data integrity and making data entry more efficient. When attributes are linked to specific domains, users can easily choose from the predefined values, ensuring consistency in the data collected through the web application.

While changing hosted feature layer settings might influence the overall accessibility and visibility of data, it does not directly address the functionality needed for users to select from specific values during data entry. Additionally, utilizing Web AppBuilder widgets or developing a custom web application could offer various functionalities and customizations, but they would not inherently limit attribute values or provide a selection mechanism without the underlying use of domains. Therefore, defining and sharing geodatabase domains is the most effective action for this purpose.