My blog is image centric and the uploads folder had become a bulky 1.7 GB.. When I checked I found that there were thumbnails of different sizes for each folder, from the earlier themes and other settings.
I used “Thumbnail Cleaner” to clean and regenerate the thumbnails. But am stuck with a problem.
While customizing I had set the size of my featured image as 800×375 in the settings for the theme. But the thumbnail regeneration created thumbnails of the specified size in the media settings but not the ones in the theme settings.