2 aircraft and 2 cabin layouts, from the A350-900 to the A350-1000. Pick one for its seat map, the best seats and the seats to avoid.
There are seat maps for 2 French Bee aircraft here: the Airbus A350-900 and the Airbus A350-1000.
The Airbus A350-1000, with 484 seats: 40 Premium Economy and 444 Economy in its main layout.
The Airbus A350-900, with 31" of seat pitch in Economy and seats 16.7" wide.