Hi Michael,
Thanks for posting! Fire App Builder has been open sourced and is hosted on GitHub [1]. There’s a separate team that maintains its repository, and I would suggest posting in the repo’s Issues section [2] instead of this forum here, and someone will assist you there.
Alternatively, if possible, look at building a generic Android TV app, that way you will have more control over its UI and features. Thanks!
[1] GitHub - amzn/fire-app-builder: Fire App Builder is a framework for building java media apps for Fire TV, allowing you to add your feed of media content to a configuration file and build an app to browse and play it quickly.
[2] Issues · amzn/fire-app-builder · GitHub