Step 1: Open the YouTube app on your iOS device and tap on your profile photo at the upper right side of the screen.

  Step 2: In the menu, find Settings and tap to open the YouTube app settings for your iOS device.

  Step 3: Find Dark Theme and tap to toggle the switch on to enable Dark Mode.

  Note: Enabling YouTube dark mode on iOS is device specific, which means that if you enable it on your iPhone, the dark theme will only be on your iPhone, and not across all your other iOS devices. You have to enable it on each iOS device if you want the dark mode appearance on your iPhone, iPad and iPod touch.

For iOS 13 (or newer) users:

Step 1: Select your profile picture

Step 2: Tap Settings

Step 3: Tap Appearance

Step 4: Select "Use device theme" to use your device's dark theme setting.

Step 1: Open the YouTube app and tap your user icon in the top-right corner.

Step 2: Tap the word Settings.

  Step 3: Tab the word General.

Step 4: Find the words "Dark theme" and toggle on the switch to its right.

 

Step 1: Go to YouTube and click on your user icon in the top-right corner (you don't have to be signed into your account – you can click the three dots in that corner if you're logged out).

To turn on chapters for your video

Step 1: Sign in to YouTube.

 

Step 2: Go to the video you want to edit. 

Step 3: Select EDIT VIDEO under the video. 

Step 4: In the “Description” box of the “Add details” page, add a list of timestamps and titles.

For example, you can add the following details as timestamps: 

0:00 Intro

3:14 Chapter 1

5:45 Chapter 2

8:05 Chapter 3

12:20 Final words

To opt into video chapters, make sure that the first timestamp you list starts with 00:00. Your video should have at least three timestamps listed in ascending order.

The minimum length for video chapters is 10 seconds.

For videos over an hour - [hour:minute:seconds] [Chapter title]

According to YouTube, yes, they are. They are available in every country and every language.

How to disable YouTube chapters?

Just change the first timestamp from 00:00 to something else.

For example: 00:00 Intro ——> 00:03 Intro