The Windows->Tile Horizontal menu item restores the horizontal tiled window style. Any user rearrangement or size changes are retained.
The default arrangement of horizontally tiled file windows are two equally sized windows positioned one over the other with both fully visible. To reset the windows to default size and position, push the Size pushbutton in the Data Panel.
This arrangement is good for all window views but the number of files in the instantaneous Details field of view is less than that of the other styles.
Accelerator Keys - Alt 2
Example of Horizontally Tiled File Windows
In the example above, the bright green title bar of Files window indicates it is showing subdirectories of the selected directory and is the active window.