Nick here from Shopify.
From the image you added in your post, it looks like you're trying to remove a variant from your product options. To remove it you would need to go into the product options in the admin and remove the variant there. It should look something similar to the screenshot below. To remove the variant you would need to click where it says More Options and then remove the variant options by clicking the little x in the corner.
Can you try to remove them and see what it looks like then for me, please?
All the best, Nick
|a minute ago|