I always fullscreen videos, so it doesn't matter to me. I suspect you're just experiencing cognitive dissonance due to the fact it's a change from what you're

I always fullscreen videos, so it doesn't matter to me. I suspect you're just experiencing cognitive dissonance due to the fact it's a change from what you're used to. Within a month it'll feel natural and you'll have trouble remembering why the change upset you. Within a year you'll have half-forgotten it was ever any different. Within two years you'll have totally forgotten the old layout, and you'll make a near-identical complaint if Google ever changes it back.