Here's why:
* The climax of the film takes place on Endor: The final battle between the Rebel Alliance and the Galactic Empire, where the Ewoks play a crucial role, occurs in the moon's forest.
* The second Death Star is located in orbit of Endor: The Empire uses the moon as a base for their new superweapon, making it central to the plot.
* The setting contrasts with the previous films: Endor's lush and vibrant landscape offers a stark contrast to the desert planet Tatooine and the frozen planet Hoth, providing a fresh visual experience.
While other locations appear in the film, such as the second Death Star, Jabba's palace on Tatooine, and the Rebel base on the forest moon's surface, Endor serves as the most prominent and central location for the film's action and narrative.