While there are some stories in which the Protagonist refuses to change or is a change agent (they themselves don't change, but they change others), the fact is change is still present in the events of the narrative. And the agents of that change are characters interacting with each other, provoking reactions by other characters based upon their processing of those events.

You may enjoy this article on the subject: https://gointothestory.blcklst.com/screenplay-as-a-series-of-event-reactions-abe987d1e7e5