PPT Alternate backgrounds for all slides can be set in the slide master. Open the slide master of the view, and then select Insert Picture. After inserting a new picture, you can replace all the slide backgrounds of the file at once. The specific setting method is as follows:

Equipment: Lenovo Xiao Xin pad Pro 1 1.5 inch computer;

Operating system: win 10 professional edition;

Software: PPT20 10 version.

1. Open the PPT file of the computer and you can see the current background.

2. Click the Show button in the menu bar and select the slide master.

3. Then select the first page of the slide master and click the Insert Picture button.

4. Select the desired picture in the dialog box that appears, and then click Insert.

5. After inserting the picture as the background, click Close Slide Master.

6. At this time, the background image of PPT has been completely replaced.