As an example use case a video wall which has certain set up layouts (multizone) then every 30 mins or 1 hour the ability to be able to take over the whole video wall with full screen content (as per attachment) to synchronised content.
So, in effect this could also allow us to switch between layouts on a scheduled basis (e.g. multi-zone > full screen). Your example makes a perfect use case when you have multiple screens synchronised, but it could also be leveraged on single player installations.
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