The developer must have removed it when the app was crashing under the 13.x software update with the screensaver enabled. For reasons known only to Roku, they have removed the ability to have screensavers within apps. I think it's ridiculous, but that's Roku for you. 🙄
"Only standalone screensaver apps are permitted. Non-screensaver apps, including but not limited to video/audio streaming channels, games, and utilities, are prohibited from including screensavers."
https://developer.roku.com/docs/developer-program/media-playback/screensavers.md
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.