OSOPTIONS
Determines whether entity snaps apply to hatch entities, geometry with negative Z values when using a dynamic UCS, and underlays. The value is the sum of any of these values:
0 = Entity snaps apply to hatch entities, entities with negative Z values when using a dynamic UCS, and underlays.
1 = Entity snaps do not apply to hatch entities.
2 = Entity snaps do not apply to negative Z values when using a dynamic UCS.
4 = Entity snaps do not apply to endpoints of dimension extension lines.
Type: Integer
Saved: In the registry
Default: 7