The settings in the pipeline tab determine how a path is calculated.

Multi-Threaded	If enabled, path calculations will be done on additional threads, rather than on Unity’s main thread.
Number of Threads	Determines how many threads are started and used to calculate new paths.

Pathfinding
This specifies what algorithm is used to calculate a path from one location to another.

Algorithm	The currently active algorithm. The default options are A*, Jump Point Search, and Jump Point Search+. Additionally, any custom class that implements the IPathfindingAlgorithm interface will automatically show up in the drop-down menu.
Select best possible algorithm	A wizard that helps you select the optimal algorithm for your game. Note that this does not take custom algorithms into account.