The currently selected chart area is indicated by the colored title bar, once an area is selected it can be moved up or down or deleted.
Task:
Move the Aroon chart area above the MACD chart area
Step:
Click anywhere inside the Aroon chart area and ensure that the title bar of that area is highlighted by the colored bar.
Chart after Aroon area is selected
Step:
Use the ribbon menu "Chart Area->Up" to move the Aroon Area above the MACD area
Move selected chart area up
Chart after Aroon area moved above MACD area
Task:
Delete the MACD area
Step:
Click inside the MACD chart area to select it
Step:
Click on "Chart Area->Remove" in the ribbon.
Notice that after the MACD area is removed, the next chart area above (in this case Aroon) becomes the new selected area
Chart after MACD area removed