By default the Volatility Surface page opens with the volatility surface for the current commodity in the pricing page.
However, once in the Volatility Surface page itself you can easily display a volatility surface for different commodities:
To display a volatility surface for a different commodity:
In the Volatility Surface page, click the Commodity dropdown list and from the list click the relevant commodity. Alternatively, use the autocomplete functionality.
The volatility surface for the selected commodity is displayed.