From mschae’s docs

The configuration files of Grind enchantments can be found in the .minecraft/config/grindenchantments directory. If you don't know how to find this, see the .minecraft page on the Minecraft wiki. If the files don't exist, the mod will create them automatically. There should be two files here: server.json and client.json.

Defaults

The default values in the server config:

{
  "disenchant_to_book": {
    "enabled": true,
    "consume_enchanted_item": false,
    "cost_function": {
      "function": {
        "function": {
          "type": "grindenchantments:count_min_power"
        },
        "factor": 0.3,
        "offset": 8.0,
        "type": "grindenchantments:transform"
      },
      "type": "grindenchantments:filter"
    }
  },
  "move_enchantments": {
    "enabled": true,
    "cost_function": {
      "function": {
        "function": {
          "function": {
            "normal_factor": 3.0,
            "treasure_factor": 8.0,
            "type": "grindenchantments:count_levels"
          },
          "factor": 0.5,
          "offset": 0.5,
          "type": "grindenchantments:transform"
        },
        "type": "grindenchantments:first_enchantment"
      },
      "type": "grindenchantments:filter"
    }
  },
  "reset_repair_cost": {
    "enabled": false,
    "catalyst_items": "minecraft:diamond",
    "requires_enchantment": true,
    "cost_function": {
      "function": {
        "function": {
          "normal_factor": 1.0,
          "treasure_factor": 4.0,
          "type": "grindenchantments:count_levels"
        },
        "type": "grindenchantments:average_count"
      },
      "factor": 1.5,
      "offset": 4.0,
      "type": "grindenchantments:transform"
    }
  },
  "filter": {
    "enabled": true,
    "item": {
      "enchantments": [],
      "action": "deny"
    },
    "enchantment": {
      "enchantments": [],
      "action": "ignore"
    },
    "cursed_enchantments": "ignore"
  },
  "dedicated_server_options": {
    "alternative_cost_display_enabled": false
  },
  "version": 4
}

The default values in the client config:

{
  "show_enchantment_cost": true,
  "sync_options": {
    "use_local_server_config_if_unsynced": true,
    "log_received_config": false
  },
  "version": 4
}