What could be a reason for using the view bar?

Using the view bar primarily allows users to view different sets of documents based on various criteria or filters. This feature is especially important in environments where documents need to be organized and accessed efficiently, such as during legal reviews or research. The ability to customize views can help users focus on specific subsets of documents, facilitating better management and analysis of the information at hand.

In contrast to the functionality provided by the view bar, deleting documents, initiating email threads, and tracking document versions involve different tools or features within a document management system. These tasks may use separate interfaces or functionality beyond just adjusting views, highlighting that the view bar specifically caters to the need for tailored visibility of document sets.