You can configure Magento eCommerce to display a notice when your store is in demo mode to ensure that your customers know that their orders will not be processed.

Log into the Magento admin panel and hover your mouse pointer over the “System” tab on the horizontal menu. Select “Configuration” from the drop down list. Under “GENERAL” on the vertical menu on the left, select “Design” and then select “HTML Head” on the submenu on the right side. Scroll down and you will see a “Yes/No” toggle option appearing next to “Display demo store notice.”

To Enable/disable the Demo Store Notification make your selection Yes/No from the drop down toggle and click the “Save Config” button at the top right of your display in order to save this configuration change.