The Command Buttons for the Simulations Settings window include:
Help - Open help resources (online or local, based on @RISK settings); see Help Button for more information.
Settings/Actions - Window-specific settings and actions. The Simulation Settings options are:
Set as Defaults - Set the currently configured Simulation options as the default values; this setting is applied to the application and will persist between workbooks.
Reset to Defaults - Reset the current configuration to the @RISK defaults or the user-defined defaults, if those defaults have been set.