When the videos start they are set to be opaque so no part of the rectangles should be visible. The video clips last for 10s and at 12s the transparency of the Material2D is changed to make the videos partially transparent so the yellow rectangles can be seen through the entire video areas. The text indicating the sizes can also be seen at this point.
Snapshot taken while the 4 videos were playing.
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Snapshot taken after the 4 videos are over and made partially transparent
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