In LPV the technical specs require it to behave like ILS. It is angular and decreases to approximately +/- 350 at the runway threshold.
Some avionics vendors (Garmin being one of them) elect, though not required to, treat a WAAS navigator the same on an LNAV final approach segment, although the integrity and alerting is not as tight with LNAV as it is with LPV or LP. With LNAV the integrity and alerting is 0.3 n.m. at the runway threshold although the CDI scaling is +/- 350 feet just as with LPV and LP.