Users with Admin rights, Training Managers or Managers with the Assign Training permission enabled, can unassign courses from the users under their org structure.
To do so open the main navigation menu and select Courses under Training.
Find the Course in question and hit on the "arrow" symbol. From the available options select Unassign Course.
Now, you need to select the users you wish to be unassigned. You can either select one by one the desired users from the main list or you can select individual users by filtering the users populating to those being associated with the desired org structure set by you.
Select the desired users and click on Next. You have the option to unassign only users who have incomplete courses. Once the checkbox "Exclude users that have completed the course" is selected, users who have completed the course will be excluded from the unassign action.
Click on the Unassign Employees and the unassignment process will start!