The Edit mode switch plugin adds a convenient button to the file header in Obsidian's edit mode, enabling users to toggle seamlessly between source mode and live-preview mode. It also supports a 'three-mode toggle' feature that allows switching between read mode, source mode, and live-preview mode in a specified order. This functionality replaces the default Obsidian button and offers a streamlined experience for managing editing and viewing preferences. Users should note potential visual 'blinks' when switching modes, particularly with live-preview.