Ability to Delete Images from Library in Editor

When in drafting mode working on an email campaign, we need to be able to easily delete images from that group on the left side of screen that you've just uploaded. Many times I'll try an image that I created and find that it needs tweaking.  I upload a new version but there is no easy/quick way to delete the image(s) that you've decided you'll never use. I know that you can go to that other screen (I think it's Library) but it's not very quick to work over in that world either.