I would like to recommend an app named Thank You Email. We provide users with a wide range of email formats, also have the feature that sends email automatically for customers after their purchase without send it by hand.
Hope this do help!
This email is not one of default emails provided by shopify in the Email section under settings.
This is what message says:
Our team just wanted to take a second to thank you for your business, and your recent purchase. If you have any questions or if there is anything else we can help you with, simply provide us with your order number (starts with MPS) and what you need, and we will gladly help you out.
I want to change this text.
This doesn't look email notification from Shopify. Are you using any app for order fulfillment or other email marketing tool like Klaviyo? Please share your store url and access to check.