Redcraft.Dragon.V3/.minecraft/versions/RedCraft.Dragon.1.21.1/config/creativecore.json

{
  "usergroups": {
    "creative": {
      "filters": [
        "{id:\"mode\",mode:1}"
      ]
    },
    "survival": {
      "filters": [
        "{id:\"mode\",mode:0}"
      ]
    },
    "adventure": {
      "filters": [
        "{id:\"mode\",mode:2}"
      ]
    }
  }
}