The New Tab + plugin enhances the user experience in Obsidian by allowing markdown files, graphs, and canvases to open in new tabs by default. This feature streamlines workflow by enabling a cleaner, more organized workspace. Additionally, the plugin includes an optional setting that ensures if a file or canvas is already open in a tab, it will simply bring that tab into focus rather than opening a duplicate. This functionality improves navigation and prevents unnecessary clutter, providing a more efficient way to manage multiple documents and views within Obsidian.