By default, the filters list is sorted by private/public setting, then alphabetically by Filter Name. Users without Manage Site, Back Office, or Manage Projects permissions will only see the filters they have permission to edit listed here (in other words, they will see only their own private filters). Users with Back Office or Manage Projects permissions will see all public filters and will have edit or delete icons for projects they can edit or delete. Admins can see, edit, and delete all public filters as well as their own private ones.
Most of the standard filtering and sorting options available on other Collaborate grids can be used to customize the Filters list. For example, if your default role allows you to edit both public and private filters, you can filter the list to show only the private ones.