Turn captions on or off
1. Go to the video.
2. Tap zoom.
3. To turn captions on, tap "speak cloud".
4. To turn captions off, tap "speak cloud" again.
iPhone & iPad Adjust default size and style of captions
1. Open your iOS device Settings app.
2. Go to General.
3. Tap Accessibility.
4. Under the "Media" section, tap Subtitles & Captioning.
5. Tap Style to adjust display size and font style.
6. Tap Create New Style for more font styles, sizes, and colors.
Android Adjust default size and style of captions
1. Open the YouTube app for Android.
2. Tap on Menu.
3. Tap Settings.
4. Tap Captions.