Explanation
The global search box is the most efficient way to find a record within the custom object called Shipment. The global search box is a feature that allows the user to search for records across multiple objects and fields using keywords or phrases. The global search box also supports wildcards, operators, and filters to refine the search results. For example, the user could enter "Shipment*" in the global search box to find all records that start with "Shipment" in the Shipment object. The App Launcher is a feature that allows the user to access all the apps and objects in Salesforce, such as Sales, Service, Marketing, and so on. The App Launcher does not allow the user to search for records within an object, but only to navigate to the object's home page. The Object Manager is a feature that allows the user to view and manage the metadata of standard and custom objects in Salesforce, such as fields, page layouts, record types, buttons, and actions. The Object Manager does not allow the user to search for records within an object, but only to configure the object's settings and customization.