Elias here with Shopify Support. Thank you for reaching out!
Since you're using our Narrative theme, reducing the padding is a customization that's supported by our design policy. If your store is subscribed to a plan, our Theme Support team will be able to assist you with that. You'll be able to use the complimentary design time included with your plan, so it'll be free of charge.
I've taken note of your screenshots and I've sent an authentication email to your registered email, please check your inbox/spam folders and reply to it. After that, I can forward the customization request to our Theme Support on your behalf.
Looking forward to hearing from you!