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How to set Use Plus SVG vector (Vector Resolutions) picture as a slide background?
1. Click the slide that you want to add a background picture to.
To select multiple slides, click a slide, and then press and hold CTRL while you click the other slides.
On the Design tab, in the SVG images group, click mathematical-signs Clip arts Styles, and then click Format Background.
2. Click Fill, and then click Picture or texture fill.
3. To insert a picture from a file, click File, and then locate and double-click the picture that you want to insert.
To paste a picture that you copied, click Clipboard.