Documentation:Blackboard Learn Support Resources/edit notifications
Click your name in the top right corner of the Blackboard Learn window, then click 'Settings'.
Click 'Edit Notification Settings'.
Choose the course or courses for which you would like to change the settings.
You can choose an individual course (left column) or multiple courses (right column).
If you want to edit for multiple courses.
Either choose 'All', or select courses by highlighting a course on the left and using the arrows to move to the 'Selected Items' list.
There are some highlighted items in the image below that may be relevant.