@leocg It's the same! I checked the same behavior in microsoft edge and chrome. It looks like youtube did this I guess, but I found it very weird that it only happened when I hit the keyboard. Thanks for the suggestion. I'll look for a solution in youtube, now that I know it's not Opera One's problem.

@leocg I mean it only happened when I hit my keyboard. I tried login out of youtube to see if it was some type of "account customization/configuration" but it remained the same. Maybe it is youtube's fault I don't know yet.

Today I hit some keys in my keyboard and it looks like the lower section of youtube moved ("centralized") to the right, but before it was centralized in the middle. It seems that this problem affects only higher zooms (above 100%), and I use 150% zoom due to my ultrawide monitor 21:9. It's very inconvenient and ugly, here's the example (language - ptbr)