To turn off Alibaba's return shipping service, you can follow the steps below: First, log in to your Alibaba seller account. Then, find "Transaction Management" in the homepage navigation bar and click to enter. On the transaction management page, find the "Return Management" option and click to enter. On the return management page, you will see the relevant settings for the "Return Shipping Service". Find the option to turn off the service and follow the instructions on the page to turn off the return shipping service. Turning off the return shipping service may have a certain impact on your store sales, so please consider carefully before taking action.