Spielverlagerung translated:

“However, Barcelona did not even try to play through Racing’s center. They overloaded the left side alternately with different players, consisting of Raphinha, Pedri, Olmo, and Rodri. Cancelo and Adeyemi took turns occupying the half-space and the flank. Through the flexible dropping of the central midfielders and Raphinha, assignment and handover problems were created, or rather, they had more time and space. On the right, Yamal was, as so often, the sole entertainer. Occasionally, he was supported by half-space runs from Garcia or Olmo. It was striking how many players Barcelona had in front of the block.”

Fight an overload with an overload. Don’t fight the overload, become the overload. Seems to be the most obvious way to stop a team, like Racing, who like to break out on one wing. You already have everyone there to stop the counter, and Racing don’t have the pace to compete on the far side of play.