Explain Everything will support projects in portrait orientation. As an experiment, I created a couple of objects to simulate a window (with some slightly opaque rectangles to simulate glass). Then I inserted a video object behind it and opened and closed the window. I also attempted to adjust the volume of the video while recording to mimic a change in noise. Here is a project file you can download and use when the update gets released very soon!
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TEDxNYED: About Assessment