After you configure toolbars and toolpanes in the Developer, you may find that you want to go back to the default layout from the original installation. The Restore Default Layout command can revert the Developer user interface to display the original toolbar and toolpane configuration that was initially installed. Toolbars and toolpanes for all document editors and the library are automatically reverted back to the default layout when you run this command from the View menu.
To restore the default layout: