Why does the 4K canvas appear as 1920x1080 in BrightAuthor?

For 4K presentations, the 1920x1080 canvas scales to 3840x2160 when the presentation is published. When building multi-zone presentations, the X-Y size and position numbers must be doubled for all zones: For example, if you wish to display a second video that is HD (1920x1080) in the lower-right quadrant of the screen, you will need to set the video zone size (W:H) and position (X:Y) to 960x540.

Note: HTML pages must have a specified width and height (up to 1920x1080); they will then be upscaled in the 4K presentation.

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