Superuser does not use full width of my screen in browser.
My questions are small in the middle, need to be scrolled while there is much border left and right.
Superuser does not use full width of my screen in browser.
My questions are small in the middle, need to be scrolled while there is much border left and right.
That's by design. The left and right columns are fixed width. The main column in the middle has a maximum width and two minimum widths.
If the window is wider than the maximum for the three columns, you get blank padding on the sides. If the window is narrower, the main column in the center will shrink and wrap down to its first minimum width. Shrinking the window width beyond that will eliminate the right column. If you shrink the window enough, the left column will also disappear. If the width is reduced more, the middle column will shrink to its absolute minimum width, beyond which the window width can't be reduced.
What you're seeing is just the site's design.