Margin size

Is there a way to change the height of the info block when surfing through channels guide? In the top half of screen I see 4 channels. The complete bottom half of screen is split between info and then black below it with each taking up 1/4 of bottom part of screen. I would like to remove the black part and see more channels when surfing. Ideally it would be nice to be able to adjust height of info block as well.