Before the compare button appears on your storefront, you need to define which products are eligible.

1. In the app, go to Settings → Compare Visibility.
2. Add at least one entry to Allowed Product Types.
3. Optionally configure tag filters to include or exclude specific products.
4. Save your settings.

Important: If the Allowed Product Types list is empty, the compare button will not appear on any product page — even if the theme block or snippet is installed.

For a full explanation of all visibility settings, see Compare Visibility Settings under the Settings section.