While that will make it easier for older eyes to read the copy, Half-Century Mark, it won't alter the layout. In other words, the truncated thread titles will be larger, along with everything else on the page, but they will still be shortened to fit their allotted space on the page. In fact, if altering the zoom level could alter the page layout, it would be necessary to zoom in the other direction; that is, zoom out to create more space so the whole title could fit.
"Your vision becomes clear only when you look into your own heart. Who looks outside, dreams; who looks within, awakens."
Carl Gustav Jung (1875-1961)