Configuration -> Advanced Rules -> Add a new Rule
Then change the Trigger to Order Total.
Then all you have to do is enable Make changes to this section? for Other options, enable Custom Restocking Fee and enter the amount.
There are many different configurations you can put in place to simplify and streamline your returns. So, if there is a specific rule you want to put in place and aren't sure of how to do it feel free to reach out to us at [email protected]. We will be more than happy to help!
Finally just remember to click on save changes.