OrderlyEmails is a design tool that upgrades the emails that Shopify is sending for your store, but you can always go back to its default design.
If you have decided not to continue with the designs from OrderlyEmails, you can go back to using the default email designs in Shopify.
To do that, please follow the instructions below in your Shopify admin:
Navigate to Settings -> Notifications
Select the notification type you would like to reset (Ex. Order Confirmation)
Scroll to the bottom of the notification type and select the "Revert to default" button.
This will revert your template back to the original default Shopify store email.
NOTE: If your 'Revert to default' button is grayed out, no letting you revert it, you may try deleting the 'Email subject' and 'Email body (HTML)' first.