Overriding Tabs Using a Standard List Controller

Pages that use standard list controllers can be used to override tabs. For example, if you create a page named overrideAccountTab that is associated with the Account standard list controller: Then, you can override the Account tab to display that page instead of the standard Account home page.

To override the tab for Account:

1. From Setup, click Customize | Accounts | Buttons, Links, and Actions.
2. Click Edit for the Accounts Tab.
3. From the Visualforce Page drop-down list, select the overrideAccountTab page.
4. Click Save.