You can uninstall the Pro app through your Shopify store admin.
Go to your Shopify admin.
Go to Apps. Click on the Apps and sales channel settings.
A pop-up window will open wherein you will find the list of all the apps. Click on the “uninstall” button from the dropdown and uninstall the app.
That's it! The app is now uninstalled. The system is free of residual code and unnecessary files requiring manual deletion.
For detailed instructions check out the Shopify guide to uninstall the app.
Note: Once the app is uninstalled, your subscription gets terminated automatically.