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Do you mean the iOS YT app? It's at most three, two if you allow a swipe. Swipe down on the video (moves it to a smaller view in the lower-right) > tap the X in the upper right of the video. Or tap the video (to bring up controls) > tap the down-arrow in the upper left (moves to the same smaller view) > tap the same X in the corner.
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Full screen:

1. touch screen to see controls

2. touch lower-right -><-

3. touch screen to see \/ in upper left

4. touch \/

5. touch X

If the video play to the end (1) and (2) are replaced with touch X, for a total of 4.

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I am using YouTube website, on Firefox, GrapheneOS. If I click on youtube logo, it will close the video. what am I missing from not using the app? It also continues playing when phone closed/black screen
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On the Android app it takes two touches.
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