Reordering File Layout Nodes
The file layout definition provides a set of directional arrow buttons in the toolbar, which you can use to reposition any file record within the hierarchy of the file layout or any file field within its parent file record.
The up and down arrows do not change the level of the selected item, just its order among other items at that level. The right and left arrows move the selected item lower and higher in the file layout hierarchy.
Note:
When you reposition a file record in the file layout, its child records are also repositioned, and their child records are repositioned, and so on.