Not sure what you mean, do you mean to close down apps you've used? If so then double click of the home button still brings up the list of open apps and you swipe them up to close. It may be different if you've upgraded to IOS 11 but I haven't done that yet
iOS 11 is the same.
Maybe your home button is working incorrectly to perform this task. Go to Settings>General>Accessibility>Assistive Touch. This will put a moveable home button on your screen. Double tap this and you should then see your open apps.