How to Display Number of Items Sold On A Listing

[plumeinativapes]

Hi there, how do activate / enable the feature that shows how many items I have sold from the initial listing screen (eg not once you click on said listing) I am a basic store owner and the items sold appear once I have clicked on the listing, but it doesn't display the "xx SOLD" icon in red colour I see on wot her listings.

I thought it may have had something to do with amount sold, but I have 50+ items sold and I have seen other listings with less than this amount displaying in red font the amount sold.

I have added a screen shot as an example.

Any help would be appreciated.

Cheers
Brad