怎么减少掉落物消失时间

spigot.yml
world-settings:
  default:
    verbose: false
    merge-radius:
      item: 2.5
      exp: 3.0
    item-despawn-rate: 6000
    arrow-despawn-rate: 1200
    view-distance: 10
    enable-zombie-pigmen-portal-spawns: true
    wither-spawn-sound-radius: 0
    hanging-tick-frequency: 100
    zombie-aggressive-towards-villager: true
    nerf-spawner-mobs: false
    random-light-updates: false