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Select the slide that has the background graphics that you want to hide.
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PowerPoint for Mac 2011: On the Themes tab, under Theme Options, click Background, and then click Hide Background Graphics.
Newer versions of PowerPoint for macOS: On the Design tab, in Customize, click Format Background, and then select the Hide Background Graphics check box.
See also
Use a picture as a slide background
Add background graphics or transparent pictures (watermarks) to your slides in PowerPoint for Mac
Remove a background graphic or watermark from your slides in PowerPoint for Mac