Split Mode
Split mode allows you to work with two structures side by side. To enable, click the Split button in the Structure toolbar.
When Split mode is enabled, you can work with both structures at the same time.
Copying Items Between Panels
You can also drag items between the two structures (copy), or use cut, copy and paste to move or copy items between them.
Hold the Ctrl key (Alt key on Macs) while dragging an item to move the item (delete it from the original structure and add it to the new one).
Resizing the Panels
You can change the size of each panel (giving more space to one of the structures) by the dragging the separating border between the panels.