You have to choose LANPR as Render Engine instead of EEVEE.
In a recent build, LANPR panel should be under Render Tab.
This panel has a checkbox like Freestyle and is also visible under Render Tab when render engine is EEVEE or Cycles. But LANPR is not really working with Cycles or EEVEE, yet.
LANPR settings are just currently used to produce GP Strokes that can be rendered by EEVEE or Cycles and visible in viewport.
Currently, workflow is complicated and not satisfying for production. You have to add GP objects, add modifiers to meshes, configure modifier to precise relation between Meshes and GP objects.
Several settings are ignored or not working, yet.
Making everything working smoothly is the target of current GSOC2019. But for the moment, status is a WIP.
So, if you want to produce something with LANPR, safer way is to use LANPR as main Render Engine.