An image forming apparatus comprising: a display input device; and a printing unit adapted to perform printing based on a setting made on the display input device, wherein the display input device comprises: a display panel; a touch panel that is provided with respect to the display panel and adapted to accept an operation performed by a user; and a panel control unit; wherein when a preset start condition is met, the panel control unit is adapted to control the display panel to start displaying an item selection screen that is a screen including a first region and a second region, the panel control unit is adapted to perform control so that an item selection key for selecting an item is displayed in the first region, when starting to display the item selection screen, the panel control unit is adapted to perform control so that a normal navigation image for selecting a category of the item is displayed in the second region, when a preset wait time has elapsed since a start of displaying the normal navigation image, the panel control unit is adapted to control the display panel to perform reduction display in which, in place of the normal navigation image, a reduced navigation image is displayed that is obtained by omitting some contents of the normal navigation image so as to reduce a display area of the reduced navigation image, the reduced navigation image including an expansion key, while the reduction display is performed, upon recognizing, based on an output of the touch panel, that the expansion key has been operated, the panel control unit is adapted to control the display panel to redisplay the normal navigation image in the second region, the panel control unit is adapted to control the display panel not to perform the reduction display even when the wait time has elapsed since a start of redisplaying the normal navigation image, and control the display panel to continue displaying the normal navigation image, and while the reduction display is performed, the panel control unit is adapted to control the display panel to display, in a third region, a character string indicating a present set value as setting information, the third region being a region within the second region, in which, prior to the reduction display, the normal navigation image had been displayed and a region emptied as a result of the reduction display. a display input device; and a printing unit adapted to perform printing based on a setting made on the display input device, wherein the display input device comprises: a display panel; a touch panel that is provided with respect to the display panel and adapted to accept an operation performed by a user; and a panel control unit; a display panel; a touch panel that is provided with respect to the display panel and adapted to accept an operation performed by a user; and a panel control unit; wherein when a preset start condition is met, the panel control unit is adapted to control the display panel to start displaying an item selection screen that is a screen including a first region and a second region, the panel control unit is adapted to perform control so that an item selection key for selecting an item is displayed in the first region, when starting to display the item selection screen, the panel control unit is adapted to perform control so that a normal navigation image for selecting a category of the item is displayed in the second region, when a preset wait time has elapsed since a start of displaying the normal navigation image, the panel control unit is adapted to control the display panel to perform reduction display in which, in place of the normal navigation image, a reduced navigation image is displayed that is obtained by omitting some contents of the normal navigation image so as to reduce a display area of the reduced navigation image, the reduced navigation image including an expansion key, while the reduction display is performed, upon recognizing, based on an output of the touch panel, that the expansion key has been operated, the panel control unit is adapted to control the display panel to redisplay the normal navigation image in the second region, the panel control unit is adapted to control the display panel not to perform the reduction display even when the wait time has elapsed since a start of redisplaying the normal navigation image, and control the display panel to continue displaying the normal navigation image, and while the reduction display is performed, the panel control unit is adapted to control the display panel to display, in a third region, a character string indicating a present set value as setting information, the third region being a region within the second region, in which, prior to the reduction display, the normal navigation image had been displayed and a region emptied as a result of the reduction display.