You can easily uninstall Customized by following these steps:
- Restore cart liquid if you used advanced cart install.
- Restore product.liquid if you used advanced template install.
- Delete page.customize.liquid file.
- Delete "Customize" Shopify page.
- Remove products in your store that have product type of "Bare Product" or "Custom Product".
- Remove App from Shopify App menu.
Jun 10, 2020