The community member is experiencing an issue when restarting their flow in the cloud site, where they are getting the message "Custom head code is not enabled in Preview mode". Another community member explains that this message means the user has defined a custom head code (in Settings > Metadata > Custom head code), and this code is not executed in preview mode. The original poster thanks the other community member for the explanation.
It means you have a custom head code defined. (Settings > Metadata > Custom head code). It's just a message to tell you that it's not executed in preview mode
