Creating and Editing of Custom Sizes
You can create a custom size or edit the setting of the existing custom size.
On the [Custom Size Settings] screen, select [Add] or a Custom Size from the list, and click [Edit].
The [Custom Size Settings] screen is displayed.
After selecting the Unit, specify the width and height, and click [OK].
The size that can be specified is displayed to the right of the value entry box.
The registered size cannot be registered.