The invention relates to an operation device, an electronic apparatus, an image processing apparatus and an operation method. In an image forming apparatus including a touch-panel display allowing a touch operation and a gesture operation, in order to enable easy customization of print setting screen image, a CPU of the image forming apparatus executes a program including: the step of displaying the print setting screen image in the custom-set display mode (S1000); upon detection by a user input (YES in S1010), analyzing an input trajectory (S1020); if a request for changing preview display is made by a gesture (YES in S1060), storing an icon mode with larger preview area as a custom-setting (S1080); and changing the preview on the print setting screen image displayed in the icon mode (S1100).