To hide the notification pop-ups (temporarily) from the website, please follow the below steps:
1) Click on the “Apps” in the left-hand menu in the Shopify Admin.
2) Find the “ToastiBar ‑ Sales Popup App” (formerly known as Sales Notification App) from the list and click on the app name to open the configuration page.
3) Go to “Dashboard“.
4) Press the “Disable” button and wait for a few seconds as changes may take a little bit of time to apply on your website.