Hi Melanie,

Currently there is no easy way to do this and it would actually involve a fair amount of code changes to the Moodle navigation code which we would be reluctant to do.

However if you have the resources you could get a code customisation done to try and remove those links - the starting point would be where those nodes are created in the initialise function of the global_navigation class in lib/navigationlib.php - but that may have unpredictable effects elsewhere in the system as Moodle considers them to be essential root nodes.