I do set the featured image for posts but I don’t show it on posts (disabled in Customize->Blog->Posts)
The featured images are just shown on the home page, category pages and archives. Since all of these will use just 1 size for the featured image, I want to get rid of other image size that get auto-generated.
Do this auto-generation, my website uploads size has grown into 2GB (i have 1000+ posts)
I have gone to Settings->Media and made everything 0 but the image size files are still there on my server: http://prntscr.com/uhcxvi
Please help me in getting rid of these unwanted image sizes.