I'm Ann, from the team here at Shopify :)
The images in your library are linked to the files you've uploaded to your store. If you head to Settings>Files, you'll see a list of images there, and you can use the little trash icon to delete them! That said, once they are deleted, there isn't any way to get them back, so make sure you're done with the image before you delete it, or save a copy to your computer!
I hope this helps! If you have any more questions or concerns feel free to reach out to us here :)
Have a great one,
Unfortunately, settings/files contains only a small fraction of images uploaded (7 out of 300). Where I can find the rest of the uploaded images ? I need to delete lots of them as my home page is 4.5 MB heavy and I optimized & compressed all of them. Any hints would be greatly appreciated.