Can I turn it off. I don't do AMZ shipping because 1) I don't know how or where to do the package dropoff; and 2) it's more than the other shippers.
Just don't use it. Just like you don't have to use UPS, or Fed-Ex, or DHL, or anything else that is offered that you don't want.
If you go into "See all options", you can select what carriers to see, but IMO that's more work than just ignoring the single AMZ shipping offer.