Thanks for your post.
We'd like to know more about the issue you are experiencing to help you further. Are you unable to turn off the private listening o your Roku mobile app? What happens when you tried to turn off the private listening on the app? Do you receive an error code or message during the process? What troubleshooting steps have you already taken to try to resolve the issue?
With more information, we'll be able to understand the issue and assist you better.