Image forming apparatus including a preview display unit and non-transitory computer-readable storage medium storing image forming program

An image forming apparatus comprising:

• a memory that stores an image forming program;
• and
• a processor that executes the image forming program,
• wherein
• when the processor executes the image forming program, the processor
• performs processing of displaying, on a display device, a whole page preview of a page to be printed,
• performs processing of accepting an operation performed via an operation device with respect to the whole page preview displayed on the display device,
• performs processing corresponding to the operation accepted,
• performs, when, as the operation, an enlarging operation for enlarged display is accepted with respect to a particular region at an end in the whole page preview that has been displayed on the display device, processing of displaying on the display device a preview of the particular region in an enlarged manner to be larger in size than the particular region in the whole page preview, and
• performs, when, as the operation a margin specifying operation for specifying a printing size of a margin of the page is accepted with respect to the preview of the particular region that has been displayed on the display device, processing of setting a size specified in the margin specifying operation as a printing size of the margin of the page as a target of the whole page preview, and processing of displaying on the display device at least one of the whole page preview and the preview of the particular region, both reflecting the margin having the size set by the processor, and
• the margin specifying operation is a swipe operation performed with respect to the enlarged preview.