This screen displays when from the [Screen] menu you click [New Screen], and when you set [Screens of Type] to [Keypad].
Set Clear Area/Release Clear Area 
Click the [Release Clear Area] button to hide the Clear Area. Drawn keypad parts will not appear on the display unit.
Clear Area
The clear area is the redraw area, especially useful when switching between a large keypad to a smaller keypad to hide the previously displayed keypad. You can draw keypad parts, keypad keys, data displays, text, and graphics in this area.
Resize Boundary 
Drag mouse cursor on the corners to adjust the Resize Boundary of the Clear Area.