MLB.comThe regular season has fewer games, and the postseason has more games. That’s the formula by which Major League Baseball will operate this year after an agreement, just before the first pitch of the 2020 season, between the owners and the MLB Players Association for a 16-team postseason structure.
https://www.mlb.com/news/mlb-announces-expanded-playoffs-for-2020
After the top two teams from each division the two teams with the next best records regardless of division are in.