How to add custom settings in Project Settings?

I fixed it by removing the module method above and using these codes:

Header:

#pragma once

#include "Engine/DeveloperSettings.h"
#include "CurrencySetting.generated.h"

UCLASS(config = CurrencySystem, DefaultConfig)
class CURRENCYSYSTEMRUNTIME_API UCurrencySetting : public UDeveloperSettings
{
	GENERATED_BODY()

public:
	UCurrencySetting();

	UPROPERTY(Config, EditAnywhere, meta = (ClampMin = "0", UIMin = "0"))
		int StartingAmount;
};

CPP:

#include "CurrencySetting.h"

UCurrencySetting::UCurrencySetting() : StartingAmount{}
{
	CategoryName = "Plugins";

	SectionName = "Currency System";
}

Result:

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