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United operates two versions of the 767-400ER, one of which features true Polaris seating and a Premium Plus Cabin.
For guidance on the new Polaris version, use this thread -- Everything You Want to Know about Where to Sit on the 764 true Polaris and PP version
While United is in the process of completing these updates during 2023, some flights will show the old (non-Polaris) seat map but then change to the Polaris-style seat map. Typically this switch shows on the flight status page after midnight (CT) 2+ days before the flight's scheduled departure.

Boeing 767-400ER (764)
https://cimg3.ibsrv.net/gimg/www.fly...c202049dac.jpg
Seatback on-demand entertainment all seats
AC & USB available throughout the plane
Fixed bassinets - 16DEF, 28DEF

AeroLOPA 764 Diamond seats