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 “notim.app:Manage Inventory” App from the list and click on the app name to open the configuration page.
3) Go to “Out-Of-Stock Reminder -> 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.