These options are not meshing options but allow the user to configure control parameters for MeshGems-SurfOpt.
This parameter (between 0 and 10) indicates the amount of information that MeshGems-SurfOpt prints during the run.
You usually don’t have to set this parameter but you can choose to limit the amount of memory used by MeshGems-SurfOpt – It requires 370 bytes per node. Or, if you try to enrich a already big mesh (up to 2 millions nodes), you exceptionally, need to allocate more memory.
You can change the file used to store remeshing hypotheses, see How to save MeshGems-SurfOpt Parameters for further informations.