What should a developer do after designating a template field as multilist in Sitecore?

Designating a template field as a multilist in Sitecore indicates that this field will allow users to select multiple items from a predefined list. After this designation, it is essential to set up the multilist field properly for it to function as intended.

Setting the multilist list item's data source is crucial because it determines which items will be available for selection in the multilist. The data source can be a specific item or items in the content tree, enabling developers to define the scope of the selectable list. If the data source is not configured, users will not see any items to select from when they interact with the field, thereby negating the multilist functionality.

While defining validation rules, enabling versioning, and setting user permissions are also important aspects of overall Sitecore development and item management, they do not directly pertain to the immediate steps necessary after designating a field as a multilist. Validation rules ensure that the selected items meet specific criteria, versioning helps with storing different states of items, and user permissions manage who can interact with the field. These actions can enhance the functionality of the multilist but are secondary to establishing the correct data source, which is fundamental for the multilist to operate effectively.