NavMesh Area Setting (New for v. 8.4)

NavMeshes may break into pieces with certain settings and increases of the Radius parameter. Actors may not be able to reach fragmented NavMeshes, even though their existence still has an adverse impact on the system performance. You can use the Area parameter to remove the unused NavMesh fragments and islands.

• Increasing the Radius may cause the NavMesh to break into pieces.
  
• Increase the Area setting (in this case, to 1000) to remove the NavMesh surfaces that have an area smaller or equal to this value.