It is easy to test by searching for "tutorials" where YouTubers split their courses into chapters more often. There you can see a small section under the video showing how many chapters are there. It can be expanded into a full chapter sweamlane so you can select the one that you are interested in.
This feature was spotted in testing some time ago and now rolling out to everyone.
Via @ESICA channel
Tester Context:
- 📲 YouTube is a well-known video social app by Google.
- 📲 YouTube is available in Beta and you can opt-in as a tester via Google Play.
- 📲 YouTube also releases some of its experimental features only to Premium users.