*Note - you will need to have a subscription with more than one connection and an ISP with very good broadband to use the multi-view functionality correctly.
On any channel, Hold the OK button for 3 seconds, this will reveal of bunch of different options at the bottom of the screen. Scroll over to the right and click on "Multiview".

Press OK again and then choose "Add screen", then choose the channel you want to add. You can add up to 4 screens by following the same process.

