Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
I don't believe you can remove them from the list within the YouTube channel. To my knowledge, you have to use the web page to make those changes. I just tried it on my Premiere and can't find a way to clear it. I also tried the app on my iPhone, and it can be removed from the list there.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution." If you appreciate my answer, maybe give me a Kudo.
Channels on Roku are developed and maintained by the channel developer themselves. We suggest reaching out to YouTube Support for more information and to know the option within their channel that may allow the functionality you are looking for.