"RuleSets": [
    {
      "name": "default",
      "enabled": true,
      "defaultAllowDamage": true,
      "flags": "FriendlyFire, HumanNPCDamage",
      "rules": [
        "anything can hurt players",
        "npcs can hurt anything",
        "resources cannot hurt npcs",
        "hotairballoon cannot hurt npcs",
        "junkyard cannot hurt npcs"
      ]
    }
  ],

"anything can hurt players",

you are allowing it

"players cannot hurt players",

add this

nivex

"anything can hurt players",

you are allowing it

"players cannot hurt players",

add this

Thank you for your reply.
What I mean is that the state of not being in the team is PVP, and the people in the same team will not be harmed. Is there a way to do it?

add rule players cannot hurt players
add flag FriendlyFire