Open YouTube app > Profile icon > Settings > General > Appearance > Choose light theme If you don’t like this YouTube’s dark theme feature, you can easily turn off using YouTube settings.
Open YouTube app > Profile icon at the top right corner > Settings > General > Appearance > Choose from Use device theme/Light theme/Dark theme How to Disable YouTube Dark Mode on Android in 2020 Now you can see the black background in the YouTube app in your Android device. Step 5: Toggle on Dark theme toggle to activate YouTube dark mode in Android