Hello. I have over 9,000 listings. I also had to revise my listings to “free returns” to maintain top seller eligibility.
I called Ebay. If you go thru bulk revision with Sixbit or Ebay you cannot do them all at once. However, thru Business Policies you can.
Go to Seller Hub, and click the down tab next to your name in the upper left corner, then choose Account Settings, Then choose Business Policies, and you can change all your items quickly. If Business Policies doesn’t show up, you will need to call Ebay, and they will add the option. Ed