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I hate 5. there's nothing worse than clicking on a page, clicking a button and the split second before you click it the page inexplicably moves 2 inches up or down causing you to click something else
YouTube is terrible at this for me, I'll open a video go to click full screen and right at that moment all the sidebar videos popup and the whole video window shifts left and I end up clicking on another video entirely. This happens to me at least 5 times a week.
YouTube as a site is just terribly designed imo. i miss the olden days of YouTube back when videos were rated with stars and everyone could customise their channel font, layout, background colour etc
Just press 'F' on your keyboard to make the video full screen