The Editor Width Slider plugin enhances Obsidian by providing a slider in the status bar to adjust the editor's line width in real-time. Users can customize their editing experience by increasing or decreasing the line width globally or for individual files using the YAML frontmatter. This flexibility allows for a tailored workspace, accommodating different note styles and screen sizes. With its intuitive interface and file-specific customization options, the plugin supports a highly personalized note-taking environment.