buildDefaultDragHandles property
If true, on desktop platforms, a drag handle is stacked over the center of each item's trailing edge; on mobile platforms, a long press anywhere on the item starts a drag.
The default desktop drag handle is just an Icons.drag_handle wrapped by ReorderableDragStartListener. On mobile platforms, the entire item is wrapped with a ReorderableDragStartListener.
To change the appearance or the layout of the drag handles, make this parameter false and wrap each list item, or a widget within each list item, with ReorderableDragStartListeneror a subclass of ReorderableDragStartListener.
To get the idea Flutter Example
Implementation
final bool buildDefaultDragHandles;