Download and launch this server, you can also join the server by using this.
You will see the file down below or locate it from here
DedicatedServerLauncher\ConanExilesDedicatedServer\ConanSandbox\Saved\Config\WindowsServer\ServerSettings.ini
If you don’t want to download it, here is where you can find the setting file from Game Pass version
Firstly, click Open Mods file on your Xbox App/Microsoft Store, and navigates to ModifiableWindowsApps\Conan Exiles\WindowsServer\ConanSandbox\Config\WindowsServer\ServerSettings.ini