Time sensitive notification
is the feature of iOS devices such as iPhones, iPads and iMacs. Then aim of that feature is to give some notifications a higher priority that others and ensure that you don't miss anything important. The notification display on your lock screen for an hour. The feature is also compatible with other apps. All you need to do is go to settings < Snapchat < Notifications tab, then find the Time sensitive toggle and turn it off.
