This tab shows what the customer has bought in the past and what price they paid for it. The user can set a filter and then choose to use it as their default view to only see, as an example, a certain date range.
There is also a button that stays pressed until you change it so that you would only see items that are not the order you are currently on.
The user can also multi-select items from this history view and click the ‘Add to Order’ button and they will be added to this order.