To disable the app, please follow the below steps:
1) Click on the “Apps” in the left-hand menu in the Shopify Admin.
2) Find the “Notify Me” App from the list and click on the app name to open the configuration page.
3) Go to the “Basic Settings“.
4) Visit the “Status“.
5) Press the “Disable” button and wait for a few seconds as changes may take a little bit of time to apply on your website.