@El-Coder
"Product Listing" (or Create a Loop) feature is only available for transactional emails in email designer if one or more collection(s) are configured in the event. Also, the icon would appear for structure components initially, once the structure component is configured with some other content, the icon won't be available.
You can find the detailed steps here:
https://experienceleague.adobe.com/docs/campaign-standard/using/designing-content/using-product-list...