To troubleshoot why your PowerPoint is not displaying a white background correctly, please refer to the following steps:

1. Verify your presentation is set to a white color scheme
2. Check that all the images in the presentation have a transparent background
3. Ensure the ‘minimise GRAPHICS memory usage’ is unticked
4. Review any embedded objects you may have and select ‘automatically resize’
5. Check your background is already transparent and not set as a color
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   • Click SlideShow tab
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   • Click Set Up SlideShow button
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   • Select Browsed by an individual (window) option
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   • Check Manually option at Advance Slides
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