We would suggest you export your reviews first from the Shopify products review app. Then, you can proceed to uninstall their app to ensure their widgets are non visible anymore in your front end.
On the other hand, if you are looking forward to deleting their code from your store, we would strongly suggest you contact their support team and ask for their code removal. Otherwise, you might end up breaking your store.
Let us know if you need any further assistance for installing our widgets!
Hey guys I am already using the Products Reviews app from Shopify. Do I need to disable it in order for your app to work?