New
#1
Did you by any chance use Group Policy settings to disable the notifications for blocked downloads / apps
If you have that is the reason that it now appears on the screen in your image that the setting is managed by your administrator. You can set GP for app blocking enabled, but then on options set notifications disabled and if you do that, then you end up with the messages you have now.
Presuming of course that you are signed in with an account with admin rights
https://docs.microsoft.com/en-us/win...nder-antivirus