Add this to the header of a KickoffLabs thank you page (until there is UI to make this setting)

lb.html

<script>
  window.kol_leader_board_options = {
    board_settings: {
      lead_description: 'full_name'
    }
  }
</script>

notes.md

Valid options for lead_description

• social_id - ABC1234
• first_name - Scott
• first_name_social_id - Scott (ABC1234)
• full_name - Scott Watermasysk
• full_name_social_id - Scott Watermasysk (ABC1234)
• username - scottwater
• username_social_id - scottwater (ABC1234)

You can also use any of your custom fields with or without _social_id. In the event the value does not exist, the fallback will be the username.