How to make the Merchant and Expense Date fields required when entering a new expense

How to make the Merchant and Expense Date fields required when entering a new expense

How do I make the Merchant and Expense Date fields required when entering a new expense?

I was able to make the Projects field mandatory by going to Admin < Settings < Customization < Modules < Expenses < Fields and checking the mandatory box, but the Merchant and Expense Date Fields are not listed here.