When the Preview action is applied, you can see a preliminary eBay Product page. The M2E Pro preview page is only a stylized template, but not an actual eBay page.
To see an Item Preview page, you need to tick the appropriate Products from the Listing and select Preview Items from mass actions bulk.
You can choose up to 50 Items to preview at the same time, then switch between them:
The Preview page displays the main Product data, such as Product Title, Image(s), eBay Item ID, eBay Category path, Item Condition, Quantity, Price and all of the available Product Variations, which will be sent on eBay during the next List/ Revise/ Relist action.
The Preview template also gives you a brief overview of the main Item Specifics, Description, Shipping, Payment and Return data. You can find this information under the corresponding tabs at the bottom of the page. However, the available information does not contain all of the details, only the most essential points.