To remove another instructor from Blackboard course, firstly we have to change the role of the instructor to student. To do this, go to Control Panel, click on Users.
On the Users page, select Not blank option from the drop down list then hit Go button.
All the enrolled users will be shown in the list. Locate the instructor that you want to remove, click on the double-down arrow and select Change User's Role in Course.
Change the Role to Student.
Click on Submit.
Then select Not blank option from the drop down list then hit Go button to show the users list.
Now the instructor's role has changed to Student. Click on the double-down arrow button again and select Remove Users from Course.
The user has been successfully deleted.