The TreeFocus plugin enhances the Obsidian file explorer by allowing users to style files and folders based on predefined rules or manual configurations. It enables highlighting, dimming, and custom styling for important or less relevant items, making navigation more intuitive. Users can apply styles globally using matching rules or explicitly set styles via the context menu. The plugin is compatible with other tools like Icon Folder, adding versatility to visual customization. TreeFocus provides presets like 'Fancy' for quick application and allows detailed customization through settings, ensuring a tailored experience for managing vaults.