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Peter Anderson

Sorry, Takeya. Articulate Presenter only supports the default On-screen Show (4:3) slide dimensions in PowerPoint, which equates to 720 pixels wide by 540 pixels high. When creating images and videos for your presentations, you will usually want to maintain this 4:3 aspect ratio to properly fit these slide dimensions in PowerPoint. Here's how to calculate the proper (4:3) dimensions for high resolution images and videos.

This older thread has a good discussion on the subject as well.