CSS Popup (Recommended Default)
Uses the module’s built-in overlay and modal CSS. No third-party library dependency. Recommended when your theme does not already load Magnific Popup globally. This is the safer, more universally compatible choice.
Magnific Popup
Uses the theme’s existing Magnific Popup library for the popup behavior. Falls back safely to the CSS popup if Magnific is not found on the page. Best suited for themes that already include Magnific Popup to ensure consistent look-and-feel.
💡If you are unsure which mode to use, choose CSS Popup. It works without any theme dependency and behaves consistently across all standard OpenCart 3.x themes.