The default preview text is hard coded into your templates when you publish them Shopify.

To change the preview text please follow the steps below.

​Step 1:
Select the notification you would like to change by going to settings in your Shopify admin, then notifications, and selecting the notification you would like to edit. For this example we will use the "Order Confirmation" email.
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Step 2:
Find this section of code below:

Step 3:
Adjust the copy for "Order {{order_name}} has been confirmed. Thank you for your purchase. We will notify you when it has been shipped." to what you would like to show in the email client preview.

​Step 4:
Click the "Actions" drop down and select "Send test email" to see your change.
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Step 5:
Click "Save" to set your changes live.

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Please reach out to [email protected] or through the in-app chat if you have any questions!