Need to know how to delete history
There is no way to delete the history from within the app.
If you really need to remove it, you will first have to go to the Norton Mobile Security app and tap on the 3 bars at the top left and scroll down to App Settings. Scroll to the Anti Theft section and turn off the Device Administrator setting. Then you go to Android Settings - Apps and look for Norton Mobile Security. Then clear the app data. Restart your device, and start the NMS app. You will have to sign in to your Norton Account.
Be sure you turn the device administrator setting again.