This was previously set to 'Off' but now has to be manually turned 'Off' if not desired. In addition, it appears the the default behaviour is now to retain toast notifications in the Actions Center. As soon as the icon is hidden it's removed from the list.

It appears that the list now only shows apps that are running AND currently have an icon visible in the Notification area of the task bar. The Windows 10 Fall Creators update has attempted to rectify this problem by restricting the apps that appear in the list, but has perhaps gone a bit far. This problem wasn't limited to Macrium Reflect, it was a generic design issue and was widely reported. Apps could hang around for weeks after uninstalling and this led to usability issues and confusion. Prior to the 1709 Fall Creators update, the Windows 10 'Notification & actions' settings dialog would show duplicate and redundant application icons in the 'Get notification from these senders' list of apps. If a user turns off or re-configures notifications for a particular app then this shouldn't be overridable by the app itself.

There is no API for the notification Center configuration, it's 100% managed by the OS and user interaction.

Unhide macrium reflect windows 10