I could've sworn this option was present before. Then I noticed in Mail that some were swiping LEFT to delete while others were swiping RIGHT. So I went back to the swiping options, and can't find any option to delete from swiping. WTF, Apple? This is another annoying non-Apple like problem with iOS 8. It seems like every day I'm discovering some weird new bug or unintuitive feature. Grrr. Edit: Alright, so I re-enabled swipe left = flag and swipe right = archive. BUT, some messages are swipe left = archive, right = trash and some are swipe left = trash and right = archive. This is absolute madness!! Also when I completely disable swipe options, I can still swipe some messages, and they will stay partway off the screen until I swipe them back. Dammit, Apple!