• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

full screen video streaming?

Wait for final version.
It's still beta so it's normal that not everything will work correctly.
 
I'm hoping you reported the issue to MS, as well.

Since that's the whole point of running a tech preview.
 
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