The default Sheet Metal Unfold rule is set for the part in the Sheet Metal Rule.
You can change the Sheet Metal Unfold rule for an entire part using Sheet Metal Defaults on Sheet Metal tab 
Setup panel Sheet Metal Defaults.
You can override the Unfold rule for while you create the feature by changing the style selection on this dialog box tab.
- Access
- While creating a Sheet Metal feature, on the feature creation dialog box, click the Unfold Options tab.
- Unfold Rule
- Lists for selection any previously-defined Unfold rule.