Favorites allow users to bookmark their most often used reports and have them listed in a Favorites-report category. Favorites are marked with a star. Reports are added / removed from favorites by clicking the start.
Reports added as favorites are shown in the Favorites category and in the menu located in the top left corner.
If you wish to disable the favorites-functionality in your server, set $mydbr_defaults['favourites_enabled'] = false; in you user/defaults.php