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Using QuickLook allows you to quickly view a document without the need to fully open it in its respective application. This feature is integrated into macOS and enables users to select a file and press the spacebar, which generates a preview of the document. QuickLook can display various file types, including documents, images, and videos, making it versatile for checking content without interrupting your workflow.

Other options may not serve the same purpose: Preview Mode typically refers to a state within an application where you can see how a document will look when printed or exported, but it's not a standalone feature for quickly viewing files. Document View is usually associated with how documents are presented within their editing application, and Fast Access isn't a recognized feature for providing file previews in macOS. Thus, QuickLook stands out as the most efficient option for quickly glancing at files.