services.authelia.instances.<name>.settings

Your Authelia config.yml as a Nix attribute set. There are several values that are defined and documented in nix such as default_2fa_method, but additional items can also be included.

https://github.com/authelia/authelia/blob/master/config.template.yml

Type
open submodule of (YAML 1.1 value)
Default
{ }
Example
''
  {
    theme = "light";
    default_2fa_method = "totp";
    log.level = "debug";
    server.disable_healthcheck = true;
  }
''
Declared
<nixpkgs/nixos/modules/services/security/authelia.nix>