When you’re playing Halo Combat Evolved or Halo 2 campaign, you can press Tab to switch between the Classic and Remastered graphics. For CE, I strongly recommend playing with the Classic graphics because the Remastered graphics apply a false texture over the originals, which basically means that at times your shots will hit cliffs, rocks, and trees which are visible in the Classic graphics but not in the Remastered. Halo 2 remastered is peachy though.