Hi @Saraiysofia1,
Welcome to the Roku Community!
Thanks for reaching out there about the YouTube Closed Captioning feature. To enable this feature, go ahead and open the YouTube channel, and play the video. After this, select the upper arrow button on your Roku remote which you will be highlighting the title of the video. Then, press the right button on your remote and navigate to the most right corner and choose the "gear" icon which you will be prompted to the Settings. There you will find the "Closed Captioning" feature of YouTube.
We hope this works.
All the best,
Kash
Takashi O.
Roku Community Moderator
