The Lapel plugin enhances the visual clarity of your Obsidian editor by adding markers next to each heading, allowing users to quickly distinguish between heading levels (e.g., h1, h2, h3). These markers are displayed in the editor gutter and can also be used to swiftly adjust heading levels through an accessible menu. Users can fully customize the appearance of these markers for individual heading levels using CSS, enabling unique styling to match personal preferences or themes.