I have disabled all notifications in adguard.You can disable both of those, the Adguard one on Adguard settings, and the other one in phone settings..
I don't have a Samsung device but I guess the steps are similar. Go to settings - apps & notifications - all - three dots - show system - select Android System - notifications - scroll all the way down and see if you can uncheck 'VPN status'.I have disabled all notifications in adguard.