The File Explorer Markdown Titles plugin enhances Obsidian's file explorer by displaying the first markdown header from each note alongside its filename in the sidebar. This provides quick visibility into the content of notes without opening them. Additionally, it updates the graph view to replace note titles with their markdown headers, offering a more informative and content-focused visualization of your notes. The plugin operates seamlessly without requiring configuration, making it a simple and effective tool for better navigation and overview of your vault.