On my android phone in norton under device security I elected to engaged the lock screen feature. I now want to unit that choice. How can I undo that action?

If Norton prompted you to use a screen lock, it would have sent you to the setting in Android Settings. So you need to go to Android Settings > Lock Screen. Then tap on Screen Lock Type. Enter your current security PIN or whatever you set up. Then tap on None to remove the lock setting for your device.

Just be aware that you are removing the first line of defence in case your device is lost or stolen. And Norton will show a warning that your device is not protected by a screen lock.