The Sanctuary level is displayed at multiple places: 
  • In the top left corner of Enclosure view (where you see the list of creatures in the Sanctuary).
  • In the top left corner of Caring view (where you can feed/play/interact with one creature at a time).
On the Map:
  • On the Sanctuary itself, the level is displayed on the tip of the column of the Sanctuary building.
  • When the Sanctuary is in close up view, the level is displayed in the top left corner.