How do I disable the double drop of monster gear in Expert and Master difficulty？

Hello, inside your world config folder you can find majruszsdifficulty-server.toml and there is Features.DoubleLoot to do that

I can't find the majruszsdifficulty-server.toml in my world config folder,only majruszs-difficulty-common.toml in config.version 1.16.4-1.1.0