How to turn on or turn off dark mode on YouTube

How to turn on or turn off dark mode on YouTube
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    If you want to enable dark mode for your YouTube app in iPhone then open YouTube application
    and then tap on this small circle icon on the top.
    Go to "settings" and here there is an option called "Dark theme".
    Enable it and here you can see you have enabled dark theme for YouTube app.
    Now if you want to again go back to the normal mode, you have to tap on this circle icon
    here.
    Go back to the Settings and then disable this dark theme.
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