ECB offers a layout type “left-right” with special ECB-tree-windows on the left and right side of the edit-area. The layouts “leftright1” and “leftright2”are examples for this layout type. See Creating a new ECB-layout and The layout-engine for details about how to create or program more layouts of this type.
Such a layout is eventually the best choice for big screens because the several ECB-tree-windows are bigger and can display more informations without scrolling.
With such a layout it can could be senseful to reduce the value of the
ecb-windows-width compared to layouts of type left or
right. A value of max. 0.25 should be enough.