The video is too far zoomed in to tell what's going on - the border of the NavMesh, details of the character's Inspector, the NavMesh's Inspector, and the value of the "Pathfinding update time" in the Settings Manager will need to be known.
If you are outside of the NavMesh, however, know that pathfinding cannot be enabled.
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If you are outside of the NavMesh, however, know that pathfinding cannot be enabled.