Even with the Menu Mod and the necessary library mods installed, it's not possible to access the configuration in-game. Also, when I go to the configuration folder in the game directory, there is just this:

Also have this, for me enchantment re rolling is too powerful and I can't diasble it

I found it, this config is per world and you can find it in world directory/serverconfig or when your are in a world open using command: /config showfile easymagic SERVER
But still global config would be nice.

The world specific config file is a Minecraft Forge thing. I'm using the Forge system on Fabric as it makes maintaining mods for both mod loaders a lot more manageable.
World specific configs have the huge advantage of being automatically synced to clients when playing on a server which is an important thing to avoid desync issues.

You can set a global default config though. Copy the config file from your world to .minecraft/defaultconfigs. It will be used for all newly created worlds.

Oh an the in-game configuration is still being tested.

The world specific config file is a Minecraft Forge thing. I'm using the Forge system on Fabric as it makes maintaining mods for both mod loaders a lot more manageable. World specific configs have the huge advantage of being automatically synced to clients when playing on a server which is an important thing to avoid desync issues.

You can set a global default config though. Copy the config file from your world to .minecraft/defaultconfigs. It will be used for all newly created worlds.

Oh an the in-game configuration is still being tested.

I can't see the option to make rerolls cost resources, as stated in the mod FAQ. Instead, rerolls can only be disabled.

In-game mod configuration will be included in Forge Config API Port when this PR is merged with Forge, so it can be ported to Fabric.