Enable Demo Store Notices Archive
In Magento the default text for Demo Store Notice is "This is a demo store. Any orders placed through this store will not be honored or fulfilled.", and you want to change the Demo Store Notice Message.
Suppose you are developing the Magento store and wants to display the Demo Store Notices, This functionality is already by default in Magento, you can Enable or Disable it through the Magento Admin, I am trying to