Assembly: Microsoft.SharePoint.Publishing (in Microsoft.SharePoint.Publishing.dll)
After calling this method, the GetAvailablePageLayouts method returns the complete set of PageLayout objects. The IsInheritingAvailablePageLayouts property is set to false. The IsAllowingAllPageLayouts property is set to True.
After calling this method, you should call the Update method to save the changes.
This operation is synchronous.