To change the position of a chart or a key:
Select a location on the chart or key that is within the bounds of the chart or key but does not contain other items (see Selection Tools).
Hold down the mouse button but do not release the button yet.
Move the mouse to the drag the item to a new location.
Release the mouse button to finish moving.
The Arrange command provides a quick way to quickly layout all the charts and the key in the Chart Diagram file. It is invoked by selecting the Arrange Icon from the main tool bar. All the charts are laid out in a horizontal row with the key being placed at the right hand side.
When columns are added to a chart or a new chart is added to the Chart Diagram file, the key needs to be shifted to the right so that the charts do not overlap the key. By default this happens automatically. If, however, you have changed the layout of the chart(s) and key manually, then you may wish to turn off this automatic layout so that it does not undo your hard work. This can be done by deselecting the 'Automatically arrange charts and key' preference option. For more information see Preferences.
Alternative sources of explanation: