The permission page that based on permissions on items in the menu list. It means if the user has a read permission in the report item in the menu list -> The user can see the report page. For restrict the user to access pages. Please follow the steps below

1. Go to the settings page. Then click the menu link in the configurations section
2. Edit the permission of items(Report,...). Then remove all permissions of users who you don't want to them access. Please refer the document guide to know more detail