Ted here from Shopify, thanks for reaching out to us!
This is a great question! I've been chatting with our Theme Support and they've advised that they would need to take a closer look at your account to apply this change. As you are using Shopify's Supply theme, our Theme Support will be able to review and apply this change for you with some Design Time as mentioned here. I've emailed you directly to help get things started. If you would like for me to raise this further for you, please reply back to my email.
I've also taken a look at your store and everything looks great so far! Has the store been published as of yet? How are you finding Shopify at the moment?
Thanks a mill,