Can I create a design with multiple pages using different artboard sizes on each page?

For Multiple Artboard Sizes, Use Separate Designs

If you want customers to have access to multiple items that use different artboard sizes, you’ll need to create separate designs for each item, then connect each item in Corjl to the same listing in your shop.

Whatever dimensions are set for an artboard will be maintained through all of the pages in that design. Please note that you can attach the same product ID from your shop to multiple items in Corjl. Read more about adding multiple product IDs.