This setting hides any line item properties that begin with a single underscore (_). These are often added by third-party apps or custom scripts to store internal data, such as personalization info or product metadata.

This setting only affects visibility in the Upcart cart drawer. Your Shopify theme’s cart page may still display these properties.

Upcart > Editor > Settings > Advanced Settings
Look for “Hide properties starting with single underscore.”

Any line item properties starting with _ will be hidden from the cart drawer. This keeps the layout clean and avoids showing technical or irrelevant data to customers.

These properties will remain visible. This can be helpful if you want customers to review their personalization choices or see other custom product details.

Let me know if you'd like this paired with documentation on personalizing products or using Upcart with custom product builders.