Q: How do you remove apps from purchased part on iPhone 6 s plus

Are you trying to delete the app, or the reference in your Purchased section as you refer in the title? If the purchased, you cannot remove it from there, since you downloaded/purchased it. That makes it available again if needed. You can hide them in iTunes on the computer, I'm not sure that is an option on the phone. Hide and unhide purchases in iTunes or iBooks on your Mac or PC - Apple Support