Content too wide for the screen and no scroll bars

[phistuck]

I have a 1920x1080 screen (normal DPI), so I expect to see all of the content without scrolling and if not, at least to have an option to scroll. But currently, the left part of the page is hidden, it does not fit the screen and there are no scroll bars.

[phistuck]

Oh, now I see that if I press F11 to make it full screen, all of the content appears. That is weird, though...