Recents lists the user's recently used apps on the TV. You can access Recents by hovering the Recent tile from the System Area. The following images show Recents of webOS TV 5.0.
Recent tile is located on the right side of the System Area. You can switch to the last used app by clicking the Recent tile.
Recent cards show the recently used apps in left-to-right order. The images shown here are dynamically provided by the apps.