Simple Delivery is not compulsory..... yet, so you can opt out if you wish. I believe you'll need a laptop / PC and use Chrome for this, not the app or mobile browser.
When creating a new listing here's how to opt out:
Click on Collection then straight away back to and click on Postage Only, and the Custom option shows, you are then able to select the postage service and cost you wish to use.
@redmiller67
