Enabling YouTube dark mode is a simple task, and here’s how you can do that on PC, Android, and iPhone:
Go to YouTube.
Sign in to your account. Click on your profile picture at the top right of the screen.
You can see “Dark theme: Off.” Click on it.
Click on toggle beside “Dark Theme,” and that’s all.
Here are two important things to note:
For each browser, you’ve to enable dark mode separately.
Repeat the above steps to turn off the dark theme on YouTube.
Keep in mind that the above steps can disable the dark theme in YouTube for Android.
Open YouTube app.
Hit profile picture > Settings.
Hit the “Dark theme,” and that’s all.
If you want to disable the dark theme, then follow the above steps.