D&D DM Screen - Elemental Evil - Rules of Play says:
Manage your campaign with this indispensable Dungeon Master accessory for the world’s greatest roleplaying game. Its landscape design allows the Dungeon Master to easily see beyond and reach over the screen, even as it keeps die rolls and notes hidden from players. Tables inside provide essential support for the three pillars of play–combat, exploration, and interaction–to Dungeon Masters of all skill levels.