I'm not sure if you're talking about their mobile apps or their website, but on the website the answer is yes. You can resize the time box by dragging the left

I'm not sure if you're talking about their mobile apps or their website, but on the website the answer is yes. You can resize the time box by dragging the left and right edges (see the arrows at the top?) and then there is also a "Filter by Time" drop-down in the upper right that gives you a few pre-set options like "no morning departures" or "hide red-eyes".