Request Refund option is not showing in my 2checkout merchant account

Question

My account is in demo mode and I placed the order using 2checkout Convert Plus. I want to implement the refund procedure for my project, but refund option is not shown in the order details page of 2checkout merchant account. In the documentation 2checkout refund documentation it's said that refund option will be shown in the order details page, but it's not showing for some reason. What's I am missing?