If you are seeing the above error message, you are trying to access Leganto while you are in Blackboard's Student View.
Leganto cannot be accessed from this view. The message is directing you to turn off Blackboard's Student View mode, and then enter Leganto where you can select the View List as Student option from the ellipses menu (see link below for more information). The two systems have their own student views, which must be accessed separately.