How can I change the column headings in DPD Print?

The column headings in the order pool can be selected and deselected. A click with the righthand mouse button on a column heading opens the dialogue box below with selection fields for available columns. Column headings can always be arranged and moved by holding down the left mouse button. A left click on a column heading or the correspondingly clicked column (e.g. alphabetically ascending) and another left click changes the sorting order (e.g. alphabetically descending). A third mouse click cancels the selected sort order.