Just to reiterate, a Thumbnail is a smaller representation of a picture you have uploaded as content for a post (article).
In the “Media” section above, it had been stated that if you change the default dimensions of your Thumbnail settings, you would need to use the “Regenerate Thumbnails” tool if you have already uploaded pictures which have been converted to Thumbnails.
Essentially what this does, is align previously uploaded images to match the current (or changed) dimensions for your thumbnails. While this process is not reversible, you can change Thumbnail values back to the old dimensions and click the “Regenerate All Thumbnails” button again to change them to their old values.
Using this option creates a uniform appearance of all thumbnails across your Merchant Shop.
← Regenerate Thumbnails