I recently hit something in my keyboard while i was distracted and my youtube video frame size suddenly increased. It is not the zoom or ctrl+/- thing. That is still at 100%. It is something else that has changed, and it shows a larger video size only when i open youtube in incognito window. In the normal window, Youtube video frame is still the normal size. And it is not the theater mode either. I have it on default view. Below is how it normally looks vs how it is looking now
how it normally looks
How it is looking now
Can anyone suggest how to reduce it back to its normal size?