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Can't delete a custom reference field that I accidentally duplicated under 'categories' on my ecommerse store

Hi I accidentally created a custom reference field under the e-commerce ‘category’ section without realising it was automatically a mandatory field. Now, there is no option to remove it and is now requiring me to link the category to the product twice - as seen in the screenshot. Any idea on how I can remove it? There doesn’t appear to be a delete button under the categories settings.

Here is my public share link: