Steps (AddTest -> Individual User (Removal)):

  1.  Navigate to 'Add Test' or 'Edit Test' page from the 'Tests > Tests List'. 
  2.  Go to the 'Assignment Information' section and in it see the selected user(s) under the '+ Individual Users' button.
  3.  Click on either of the buttons listed below 
    1.  'Remove All' (If you have to remove all the users then click on it.),
    2. 'Remove' (If you have to remove the particular user then click on it). 
  4. After that, a modal window will be popped up asking for the confirmation of removing the user(s).
  5. Click on the 'Yes' button to remove. If not then click on the 'No' button.