Be aware that Moodle has changed the settings of the navigation block of Moodle 4.0 version. If you have upgraded to Moodle 4.0 and have not seen Instructor and Learner Dashboards, these are the steps you can check to add the dashboards back to the navigation:
Step 1: Go to Site Administration > Appearance > Themes > Select your theme( i.e. BOOST) > General Settings > Unneeded Blocks - Please make sure that *navigation* is not listed in this area. In case you have nothing configured here, keep it empty and move to Step 2.
Step 2: Add "Navigation Block" to your Homepage/Dashboard
If you still can't see Instructor and Learner Dashboards in the Navigation of your Moodle 4.0 or have any other questions, please reach out to Helpdesk@intelliboard.net