Simplifying configuration of multiple display units for a desired common use. In an embodiment, a user interface is provided to show the display units connected to a digital processing system. The user selects any desired set of display units as a group and, in response, the possible set of display modes (corresponding to the types of common uses) for that group is indicated. The user may select a desired display mode to cause images thereafter to be rendered on the group of display units in the selected display mode. When the group of display units is driven by multiple graphics processing units (GPUs), a user may be provided the option of selecting the specific ones of the potential processing modes in which the GPUs are operable together.