Use the Use Snubber check box to apply or remove the snubber from the output.
Change the snubber components by clicking the black down arrow control on the right of the calculator icon 
and selecting Change.
The Snubber Components dialog box displays the parameters of the currently selected snubber.
To edit a snubber components:
Use the Use Snubber check box to apply or remove the snubber from the output.
Change the snubber components by clicking the black down arrow control on the right of the calculator icon and selecting Change.
For resistor the Snubber Resistor dialog box appears where you can use the calculator icon to select the custom parameters from the drop-down lists.
For capacitor the Capacitor dialog box opens where you can select another capacitor .
icon and click Default.