This recipe will take you through the basics of various functionalities available in Gephi's Overview mode.
Run Gephi and load a preexisting network. The first screen that you see is the Overview mode, which is otherwise called the Graph Manipulation mode in Gephi. If you already have Gephi running, clicking on the Overview tab in the upper-left corner of the screen will take you to this mode.
When in Overview mode, you'll able to perform a wide variety of manipulations on the graphs. These are categorized under the following subsections in the Overview mode, each located in a different part of the Overview screen: