NEWTOWN SQUARE, Pa. — Since returning to the PGA Tour in January after a surprising decision to part ways with LIV Golf late last year, Brooks Koepka has maintained a level-headedness about his time on the upstart circuit, pointing to personal family issues among his reasons for leaving . The five-time major champion, who has won the PGA Championship three times, maintained that stance on Thursday following the first round at Aronimink Golf Club, where a 1-under-par 71 had him just two shots from the top spot on a crowded leaderboard. The off-the-course news of recent weeks saw the Public Investment Fund of Saudi Arabia announce that it would no longer be funding LIV Golf beyond this year. “I don’t have any involvement with it anymore, so I don’t pay any attention to it,” Koepka said. “I’m kind of in my own little world, and I’d like to stay there.…