Method/step: 1. We open the PPT file that needs to be modified. Quickly select a layout you want in the "menu bar" design, and click to see the effect.

2. Click "File" in the upper right corner to create a new one, and you can see many theme templates to choose from. Just select what you want and create one.

3. Select the PPT page, right-click "Set Background Format", select "Pattern Fill" and select the desired pattern.

4. It would be better if there is a designed or downloaded background image. Change the content page first. Select any page of PPT, right-click "Set Background Format", select "Picture Fill", insert the picture source, and click "File" to select the picture to be inserted. Finally, click Apply All. Then, because the cover page and the content page are often different, we have to repeat the above steps, select the cover page of PPT, right-click Set Background Format-select Picture Fill, and insert pictures from-click File to select the pictures to be inserted. Do not select "Apply All" at this time.