The inline player lets you watch videos while you browse YouTube.
Note: If you watch a video for a certain amount of time while browsing, it may enter into your watch history. Learn more about how to manage your watch history.
The inline playback lets you fast forward, rewind, and watch videos while you browse the Home page 
To turn the inline player on or off:
- Click your profile picture
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- Click Settings
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- Click Playback and performance.
- Turn Inline playback on or off.
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.If the inline playback is not turned on, you can only watch 3-second video previews.