Expanding, Collapsing, and Rearranging Widgets
Each widget can be expanded or contracted by clicking on the widget title bar.
Widgets can be moved by hovering the mouse cursor over the widget title bar. When the mouse cursor changes to four arrows, hold the left mouse button down, drag the widget to where you want to place it, and then release the mouse button (this cursor motion is called drag and drop).
Adding new Dashboard Widgets
Plugin or theme developers can make new Dashboard widgets available through the plugin (or functions.php) code. For more information, see the Dashboard Widgets API.