TJ Walker advises that the most important visual design decision in a PowerPoint presentation is to use one clear image per slide so an audience member can understand the idea within two seconds and connect it to the slide’s main purpose. He downplays logo/colors/font choices and frames this "2-second" clarity as the primary way to improve comprehension, retention, and action.
Your visual design has a massive influence on how your audience understands your messages, remembers them, and can acts on them, but not in the way you typically think. It's not about the right logo design, or picking the perfect colors for the fonts, or arranging the fonts. No, the number one thing you can do with a visual presentation of PowerPoint is have one image per slide where someone sees it and within two seconds can instantly understand the idea you're trying to communicate and connect it with some purpose of your message that is the most important. You.
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