Star Trek: Picard Season 3 was a celebration of the franchise's legacy, from the inclusion of the NX-01 refit to the christening of a new USS Enterprise. The series also drew on the many ship designs in Star Trek: Online for the Frontier Day fleet. However, the ships introduced in Picard, including the Enterprise-G, drew on classic Star Trek designs to make Starfleet feel new.
Source:https://www.cbr.com/picard-enterpriseg-old-new-designs-star-trek/