YouTube has rolled out its new player with a slicker design to all using the browsers across the platforms. The player UI is designed in such a way it doesn’t come in your way and offers transparent, auto hiding controls.
Watch Later button in the New YouTube Player
If you frequently visit YouTube and watch videos on it, with the new design, if you started to look for ‘Watch Later’ button, don’t worry Google has not removed it, you can find it below ‘Add to’ playlist section or you can find it in the upper corner of the screen when the video is playing in full screen.
Currently, YouTube is not offering any way to opt out of this player. If you’ve issues with it, try clearing the cache or disable all YouTube related extensions installed in the browser to find out the issue.