Is there any way to change the shipping label setting to the format 4x6?

Yet another example of Shopify making things SO MUCH HARDER than they have to be.

Why isn’t there simply an option in the Shipping and Labels section of SETTINGS for your store, the place that literally everyone would look first to change a setting like this?

Nope, instead it’s buried in the actual shipping page for individual orders? Ridiculous. I spent HOURS figuring this out, and never would have without this thread. Shopify’s UI is just an embarrassment.