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If you use both unlimited Wi-Fi and limited mobile data to watch YouTube videos, you should change the video quality preferences, to get the perfect balance between data savings and great video quality.
There select the Off option to disable the auto playback of Youtube in feeds (or you can set it to Wi-Fi only). After that select Settings then General > Playback in feeds. Tap on the Profile icon given on the right top side. To change this Youtube video Playback in the feeds, open the APP. Furthermore, audio is not played when the video is played in the feed, and thus, it might seem to be an unnecessary feature for users like me and many others, if not for all. In this situation, you have to rewind the video to actually watch it, which is an extra hassle. On actually playing the video, it will start exactly where it left off, in the feed. If you jump into something else with YouTube open in the foreground, the video will start playing.
The playback in feeds is a great feature if you want to sneak peek at the videos without actually playing the video, but the feature is not devoid of problems.
Disable Youtube Auto video playback in feeds