Kevin Costner became a household name in “Yellowstone,” attracting millions of fans to watch the epic tale of a Montana ranch. But when it came to the opening of Costner’s “Horizon: An American Saga – Chapter 1,” the reaction was more muted, according to The Hollywood Reporter. Costner walked away from “Yellowstone” amid talk of a feud with Taylor Sheridan, the show’s creator, to make “Horizon,” which has involved a commitment of millions of his own money. The $100 million film’s opening weekend brought in $11 million, which equates to about 1 million people in the seats, entertainment researc…