We are going to miss you:(  
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To uninstall the app first you need to delete the code from your files by following the below process:

Go to Online store >> Themes >> Action >> Edit Code

Here in the left sidebar search for Index.liquid, product.liquid, cart.liquid & collection.liquid file.

You need to delete {% include "recently-viewed-products" %} from these files and save the changes. Also, search for "recently-viewed-products.liquid" snippet and delete it as well.

Now just delete the app from your store.

If you are not sure, how to remove the codes, you can contact us as well, we will remove it for you.