The sunrise theme can show a message on your pre-order items. This will only appear when a product has managed inventory that is 0 or less and still available to buy.
Info
See Shopify’s documention on for managing inventory on your products
Click “Customize” next to the theme name then navigate to one of your products in the theme preview.
When the product page loads, you’ll see a new section named “Product pages” in the admin sidebar.
Use the settings in that section to enable or disable the pre-order message and then save your changes.