A display device of a dialysis machine for displaying various parameters containing a quantity of patient-related treatment parameters and a quantity of clinic-related CIS parameters. The display device has one display and an input unit to individually modify the quantity of patient-related treatment parameters or the quantity of clinic-related CIS parameters. The display includes a display area divided into a first display panel and a second display panel. The display can be switched to a treatment configuration in which the quantity of patient-related treatment parameters is displayed exclusively in the first display panel and the quantity of clinic-related CIS parameters is displayed exclusively in the second display panel. The display can also be switched to a CIS configuration in which the quantity of patient-related treatment parameters is displayed exclusively in the second display panel and the quantity of clinic-related CIS parameters is displayed exclusively in the first display panel.