Final answer:
The ability to search within a specific portfolio or collection is provided by the advanced search box, which helps refine search criteria in databases or digital libraries. It's especially useful for targeted searches within large or thematic collections.
Step-by-step explanation:
The option to search a specific portfolio or collection is typically found under the advanced search box. The advanced search function allows users to refine their searches by various criteria, which may include date ranges, types of material, or specific collections. The purpose of the advanced search is to enable you to find the most relevant information in a database or a library's catalogue.
For instance, in a digital library, the advanced search box may allow you to select a particular collection or portfolio to limit your search results to only those items that are contained within it. This can be particularly useful if you are searching for materials that are part of a themed collection or if the library has a vast amount of content, and you want to ensure your search is as targeted as possible.