Overlay-Mode is a picture-in-picture feature that allows you to watch Zattoo while using other windows.
This is how Overlay mode works:
Overlay-Mode shrinks the Zattoo video into a small player that you can move around your screen and position over other windows. Clicking in another window does not move the Overlay window to the background > The Zattoo window in Overlay mode remains in front. The size is adjustable. To end Overlay-Mode, click "X".
How to activate Overlay mode in the player:
Click on the Overlay mode icon > The player opens in a separate window and can be moved to any position on your screen.