Or when you have archived your sent items, Format of this folder is similar to Inbox and it becomes difficult to check whom you have sent as it has From field rather than To field.
In order to customized this setting, you can follow following simple steps
- Right Click on Header Field [ Anywhere near From, subject, etc]
- Then Select Customize current view
- Click on Fields
- Add the Field you need to view and adjust its position by Move Up or Move Down Icons.