If the arrow is highlighted, it enables \emph{drag and drop mode}.
In drag and drop mode, clicking in the timeline does not reposition the insertion point.
Double-clicking in the timeline selects the entire edit the mouse pointer is over.
Dragging in the timeline repositions the edit the mouse pointer is over.
This is useful for reordering audio playlists, sorting movie scenes, or moving effects around.
If the arrow is highlighted, it enables \emph{drag and drop mode}.
In drag and drop mode, clicking in the timeline does not reposition the insertion point.
Double-clicking in the timeline selects the entire edit the mouse pointer is over.
Dragging in the timeline repositions the edit the mouse pointer is over.
This is useful for reordering audio playlists, sorting movie scenes, or moving effects around.