There is no setting for recording GPS L1 on the MAX2771 GUI available.
MAX2771
Production
The MAX2771 is a next-generation Global Navigation Satellite System (GNSS) receiver covering E5/L5, L2, E6, E1/L1 bands and GPS, GLONASS, Galileo, QZSS...
Datasheet
MAX2771 on Analog.com
There is no setting for recording GPS L1 on the MAX2771 GUI available.