The split list view display format in Lightning Experience is available for objects that are accessible via a tab on the current app's navigation bar. To enable users to open a list view in the split view format, they must first click the object's tab. Since the support team wants to view Shipments in a split view within their primary application, the administrator must add the Shipments object tab to that application's navigation bar.

A. Filter by a single shipment record type in the list view.

Filtering a list view by record type is a data visibility feature; it does not enable or disable the split view user interface display option.

C. Split views are only available on standard objects.

This statement is incorrect. Split view is available for most standard objects and custom objects, provided their tab is included in the Lightning app's navigation.

D. Add the Manage List Views permission for support users.

This permission allows users to create, edit, and delete public list views. It does not control an individual user's ability to choose their preferred display format (Table, Kanban, or Split View).

1. Salesforce Help, "Considerations for List Views in Lightning Experience": This document clarifies the availability and usage of split views. It states, "To open a list view in split view, click the object’s tab in the navigation bar." This directly supports that the tab must be present on the navigation bar. It also confirms that "Split view is available for all objects," which invalidates option C.

2. Salesforce Help, "Customize the Navigation Bar in a Lightning App": This guide details the procedure for an administrator to add items, such as an object tab, to an app's navigation bar using the App Manager in Setup. This is the specific action required by the correct answer (B).