These are different type of loans and you should call AOCG to make sure you have the appropriate one checked. The most common one is "Default". Notice in the example above, there is a checkmark in the column "Default" for the Company Setup Default description. This is the default payment method.
You will "uncheck" the checkbox for any loan types that you do not want to be Active. Any that are checked are selectable from the Loans Tab in the Clients window.