Splitters
Select Splitter
A splitter allows your end user to visually resize fields either right to left or top to bottom depending on how you add your splitter. Select the Splitter item in the Customization window.
Drag Splitter
Drag the Splitter to the window where you want the user to be able to resize.
Resizing Editors
The end user will now be able to drag the splitter either left or right resizing controls on the right and left of the splitter.