If you don't make a selection, the following default options will be applied to generate your design:
Product Type: T-shirt
Art Style: Random
Model: Mystic 1.1
Magic Prompt: On
These default settings will enable your image design to still be created but the image may lack detail.
If you've previously selected your options when generating an image, those settings will automatically be applied unless you choose to modify them. For instance, if you selected a T-shirt as the product, Minimalist as the design style, and 2 designs under Mystic 1.0, these preferences will be used to generate your new image. You can always adjust them if needed before proceeding.