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Sterling, a reader of this blog who noticed the new bar, found an annoyance: "Even if the cursor isn't over the bar, it still pops up, so if you go rate a video, favorite or share it, as soon as you move near the bar, it pops up, blocking those settings, so you have to either scroll down or click on the bar to collapse it. It looks like the spot where the bar is triggered is just above where the video player ends when it's in shrink mode."
Once you collapse the bar, it no longer auto-expands, at least until you watch a new video. I couldn't find a setting that disables the bar or moves it to its original position.
{ Thanks, Sterling. }