While there's no way to opt-out, you can use incognito mode in your browser to see the other/custom thumbnails. Note: the test is only running for 7 days total. Also, we've passed along your feedback about the experience!
@TeamYouTube, how can I opt-out of this auto generated thumbnails thing
It's getting annoying.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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