I am trying to configure the appearance of notifications in the back end (information about security updates, etc.) and I am wondering if there is a way to make these notifications visible only to accounts which have the "Administrator" role.
The only thing you need to do is go to System --> Permissions --> Roles and find a tab in left named "Roles Resources". Go to "Notifications" role and untick it from all the roles other than "Administrator". It will help you stop showing notifications to all other roles.
Unfortunately, the proposed solution didn't help, I am still seeing the notifications, if logged in with an account with disabled access to notifications: